That's brilliant! Using the existing tee at 23 to tie into 8/9/5. 2 could be extended to #9 basket
I have some more thoughts/questions as well... Most of this I can't give a real concrete opinion because I don't have enough memory/knowledge but they are just ideas based on my memory/maps...
1>1A - If it really is too difficult to get to a fair landing zone to approach the basket, are there any trees that could be removed to achieve this rather than just relying on chance...
2 - Could go to 9's basket as a short par 4 but I'm not sure that would play better than current hole 2 does as a par 3. Plus extending the hole would bring current 10 & 24 and reverse 4>3>23 more in harm's way from errant throws or "cutting the corner" throws...
10 - I would like to know how many 2's are ever recorded on this hole. It's a difficult tee shot with decent distance to an extremely treacherous pin. I feel like shortening this hole a bit to achieve more 2's might be a positive. I would usually suggest moving the basket 20-50 feet closer while keeping it on the ledge but I seem to remember the basket being in a very unique location so maybe moving the tee location up some would be the better option to achieve the same result.
11 - I loved this hole. Short and technical but still demanding. My only question would be is it possible to hit the "wall" on the left and still have a birdie putt?? Because, if it is, I would try to move the basket back a little if possible to disallow this. I feel like you should have to hit the "alley" to get a birdie.
12 - Pretty standard RHBH hole but nothing wrong with it. I remember there being a lot of trees on the second half of the hole. I wonder if a group of pros would think the line to the basket was fair or chance. If it's more chance, could the basket be moved slightly or could a tree or two be removed to make it a more fair line...
13 - I loved this hole. Very picturesque. I would like to see some pro scoring data and see how many 3's are recorded. It seemed like a very tough 3 my one time through. If it isn't getting a proper scoring spread, maybe the tee could be moved up just a little to make a birdie 3 more attainable...
14 - I loved this green. The current shot is fine but kind of nondescript. Would it be possible to have a tee adjacent to 13's basket in the open and play this hole as a par 4?? I think this green would play really well as an approach shot on a par 4. Plus, I feel like the tee could be placed down the slope some creating another incline tee shot along the hillside...
15 - I wonder if this hole could be reworked to play to current 18's basket location (possibly from a new tee beyond 14's basket), probably as a par 4... It would be great if the large tree/boulder currently making up 15 could be the "pinch point" in the middle of the fairway some way that you would need to clear in order to get a reasonable approach shot to the basket on the second shot...
16 - Another terrific basket location. If 15 were reworked to 18's basket, it would probably eliminate current 16's tee. If so, a new tee could probably be created somewhere in the first half of current 18-- which could even be an advantage since it could be an opportunity to create a gap in the tree line required to hit off the tee instead of the virtually wide open shot it is now...
17 - Very fun, technical downhill shot. If you are going to 21's tee instead of current 18's tee from this basket, perhaps there would be an opportunity to extend this hole further down the slope nearer to 21's tee. I seem to remember this basket location having some unique character though so maybe that is more important than any place it could be placed further down the slope... I'm not sure...
21 - Loved this hole. I don't remember where any improvements could be made. Perfect distance/incline to be very demanding. Just tight enough to be demanding while still having just enough to space to move a disc enough to get it all the way there. Very nice "shelf" used as a basket location.
22 - This hole definitely felt like a "poke and hope" for the last ~75 feet. Way too many small trees, in my opinion. Fun tee shot. I just feel like all of the smaller diameter trees on the green could go, just leaving the medium/larger ones. A perfect tee shot should get rewarded, not have to also get lucky.
Rev 8-9/5 - Could go 23>5 like you suggested but I seem to remember the shot off 23 as a little funky angled, in my opinion. Plus making the hole more "J/U" is just going to make people try to "cheat the corner" more and take away from the integrity of the desired hole. I would put this tee way back close to current 10's and force a very demanding shot through an alley in the forest out to the field. If that is achieved then players would have a bomb shot over the field to a spot on current hole 5 where they could have a reasonable 3rd shot to current basket 5... This would obviously be a par 5...
6 - Loved this hole. Very technical downhill shot. Loved the large boulder you have to clear mid-fairway. I don't remember anything about this hole that needed changing...
7 - I wonder if this hole could be extended to play to current hole 4's basket... (I loved that basket location. But I also think playing current hole 3/4 in their current direction is what's hurting the flow of the course the most...) If so, I'm not sure if that would be a par 4 or 5. It would just need to be played. The tee location could be adjusted as well to shorten it for a par 4 or lengthen it for a par 5 too if needed to make the score spread appropriate.
Rev 4/3/23 - I don't know how this hole would look. It would just take some designing. It should be a really nice par 4 with a tight fairway and the slope to the right the whole way with the rock face on the left.
24 - I really liked this hole. Nice, fun technical short par 3. I like the way the foliage, slope, and rock face all interact to form this fairway. My only concern was how close it is to 25's tee. Not sure if that can be avoided. Maybe the basket and tee could both be moved back away from 25's tee (especially since there should be a pretty large distance from 4's basket to 24's basket to essentially have just 2 holes...
25 - Very fun, very challenging finishing hole. I don't think anything needs to change here. If the previous basket stays close, perhaps a wall could be erected to shield this tee from the previous hole...
Could be looking at an 18 hole, par 63 layout in this configuration that would keep all of the incredible basket locations that make the character of the course while having a great flow and a terrific balance of incline/decline, left/right, and a few bomb shot opportunities despite being a forested course...