Your arm is already extended while you are still completing the weight shift as you can see from the disc already drifting to the left while you still have weight on the drive foot. My guess that is because you already out of balance and tipped back in this frame. Hershyzer would probably help here to get more of your weight above the left foot at this point.
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On the plus side, in your OG form you seem to try to lay your head on your right shoulder which looks quite uncomfortable and it looks like you got rid of that.
And it is evident you get some really good power into your discs as you start bracing slightly after the peak of your backswing and just wham the disc out.
Star Destroyer, every bomber wants to throw a Star Destroyer.
This tracks
Just edited this as i switched up drive and plant foot again
Your spot on in that video/image of the video I sent Sidewinder when I first got back to throwing. He pointed those issues - regarding back leg time, and the lean in the backswing.
When I first got back to throwing, using a walk-up / x-step did not feel natural since I did not use traditional one during my og form.
During this time as well, I was also getting more distance from stand-still/ 1 Step than I was with the x-step at this time.
Regarding the arm being extended while shifting, I understand what you mean, but like w/og form when everything is in place I have never noticed a big difference at all actually. I do know in that video clip, I am def starting my downswing a tad too soon, a lot of that was due to not yet understanding that light weight of a discs, and having to mentally make arm even heavier in my mind and delay the downswing.
But for me, normal circumstances when things are efficient and optimal - what might look like my arm all the way extended, is just loose and passively behind me if that makes sense, but when the plant foot plants down, that is when I am extending my shoulder/arm out more stretching the tendons before it is forced into the downswing. Hopefully, that makes sense.
Regarding the Destroyer comment are talking about that picture from the video I shared with Sidewinder of the pictures of og form I shared?
The disc in the picture from that video clip, that one is a Hero Halo Super Star 235, in that video. I was throwing those and Taffy ( star) Super Sonics 215 as well.
I was not throwing a Destroyer, did not actually bag a Destroyer at all.

I am throwing and holding same disc in my off hand - Discraft Z Talons

I am throwing a Discraft X Predator and holding one of my many Z Talons in my off-hand.
During that time, my preferred Distance Drivers were Z/ESP Nukes and Z/Esp Force. For distance comps it was an X Nuke.
Loved how the X Predator broke into a longer TeeBird like flight, but due to them being OOP and harder to find, I think The Discmania PD took that slot after I lost my really seasoned perfect beat in Z Predator.
The only other person I knew that used Z Talons like I did was Geoff Bennent.