re: Archery Experts - Help Needed

Some things to try

With that draw length you should go to a bow shop and crank up the poundage to @60 lbs. I had a shoulder REPLACEMENT last year the last week of May and was pulling 58 lbs by Sept 1. Got to max of 61 about a month later. I know it won’t feel great but if it hurts just gradually increase weight by 1/2 turn on limb bolts every one to two weeks as you can handle it.
Try putting a thin piece of rubber or felt on the arrow shelf itself as well as the rest prongs as needed. I too had bounceback issues but the felt dampened it as well as made it even quieter
Best move in broadheads I ever made was switching to Grim Reapers 3 blade mechanicals. Depending on your speed you could take spine out of the arrow by going to 125 gr Grim Reapers. Going to a heavier head essentially decreases spine, all other things being equal.
Good luck ;)