I have the beman mfx classics 340, per OLs site I cut to my length 29.5 bop, added the 100grn insert and started shooting, I found that to get true spine I had to drop to 100 grn fp to get them to group with fletches,this gives me 546 grns and 190 fps really wanted 150 grn point, I am pulling around 60 lbs, and could shorten up, from back, another quarter inch for spine, and increase point weight, as I have some 65 lb limbs coming I am curious as to your set up with similar specs. Regards