I’m lucky to have a space (with nothing killable behind it) in which to practice, this was at 15m but I can go up to 30m (if I don’t care about having any grouping … I’m still quite new)
If it is sitting on your thumb you have rotated your hand too far around towards the front/side of the bow.
Try staying behind the bow and putting pressure on the big thumb muscle of your palm. Use that to push straight forward and your hand should rest very comfortably.
Exactly, for the bow to sit on the muscle in the correct and comfy manner I can’t rotate it to the recommended 45 degrees. I play with the angle a little before every shot to keep my hand loose but it’s a weird shape from work (distinctly different from my right), I’ve gone through this with a good coach and he recons it’s pretty good all things considered … it’s something I’ll carry on working on :-)