1. The lake is on the left, and I throw RHBH. So if the Archangels flip, they flip away from the lake.
2. I'm sure someone of your armspeed would find Archangels to be flippy. For me, and throwing for accuracy as opposed to raw power, they fly pretty straight to slightly understable. I get them in max weight (175g), too.
3. One big problem with this particular hole and lake is the wind. I once had a disc (a TL) that I was throwing along the other side of the line of cedar trees on the right (that separate this hole from the hole next to it) get picked up by the wind and carried well over 50 ft. left and into the lake. It's also pretty narrow right around where the hole bends around the lake, so an overstable disc runs the risk of skipping left and going into the lake. Every time I watched the pros throwing in the LVC and seeing those hyzers come in, I'd think of how good it was that there was no lake there.
4. So we'll see how a DX Beast does. And yes, I'll practice with it first to see if it's understable enough to throw around that disc-eating lake...