You could improve your FOC greatly by using 4" feathers. It' ll make the arrow lighter and give you a couple fps. As for number crunching? You got plenty of energy for anything on this continent, let alone a little deer. I' ve had complete pass-thru' s with 316gr arrows at 237fps out of a 61# bow. In one case it was a 15 yard broadside shot and stuck 20" of arrow in the ground after the pass-thru. Another was about a 45 degree quartering away shot. Arrow shot thru to the opposite shoulder breaking the shoulder joint, flattening the TroCar tip and bending the ferrule. Deer just aren' t big critters my boy.