Here is my experience, for long time when I shot, I never got any pain shooting my bow. But after shooting around 50 arrows, my index finger
on the inside of the nail, I would get sore. There are a few things that I come to find out that worked:
1) I had my wife take a few close pictures of me drawing to anchor, after studying them, I noticed when I draw my index finger (my hand design) curves downward, must of been from breaking it few times when young.
2) Also in the pictures I noticed my draw elbow (if high will put added pressure on arrow downward). I went back to basics, and worked on drawing elbow straight back, keeping it level, on close bail shooting. This made a difference, and felt more back tension.
3) Get a deeper hook on the string, this will let the tendons in your hand relax, offering a better release.
4) I switched to a glove, this said for me all gloves are not created equal. I used American Leather glove for long time, then I decided to get a Bateman glove that made a huge difference, without inserts.