I don't have any particular problem with my hand or shoulder. However, I was noticing that my index finger was opening up more than I would like at full draw. I solved that by hooking my index finger a little more than the others before I started my draw, and paying a little more attention to it during the draw, so it didn't open up. I seem to shoot better when it doesn't open up more than the other ones do. BTW, for me a deep hook isn't actually hooked so my fingers are pointed 180* back, just enough so that they are pointed slightly back towards me so I don't have to exert extra effort to keep them on the string. Don't know if this will help, as you have a disability to overcome, but thought you might like to know that it can be a problem even if you don't.
One old Marine to another. G-2-9, RVN '65-66.