I bumped to 67# and it is comfortable. I dont noticce any aches or pains, just fatigue after shooting a hundred or so.
Sorry, maybe I was a little vague, I mean longer term, much, much, longer. And I know where you are coming from, I've also been there as most others have. Doubting there setup to some extent, heck I still do at times. You may want to pick up a few technique books. Kirk Etheridge is an author that I would suggest, also Larry Wise.