Consistent hand placement is important in using traditional equipment, as I am sure you know. Some bows, even bows of the same make and type, will resist consistent placement just because of the anatomy of your hand. You might try placing a piece of athletic tape under where your knuckles fall as a reference point that you can feel. That might help you with consistent hand placement.
I would also recommend paper tuning to see if your nock point is too low. I have a bow that has a very low shelf, and the feathers cut my hand while I was tuning the bow until I got the nock point high enough to get clean holes in the paper. Then it stopped cutting me. Nock height can be very sensitive and 1/16" or 1/8" can make a bug difference.