you guys must shoot and deer and never hit a rib because i have with 8 grains per inch carbons and maybe get one lung if lucky and thats at twenty yards.
You will get pass throughs at 13 GPI with a good 2 blade fixed head and a tuned bow (Somewhat tuned with that arrow weight should give pass throughs)
Choctaw
I'm shooing bemans as well. Mine are 31 inches long and I'm using Magnus Sitngers(125 gr). Mine weight 9.3 GPI. I'm only pulling 53 pounds with a not so fast bow. Have you thought about shooting a bareshaft farther? I shot mine at least to 35 yards. I always make my arrows heavy, what I mean by that is this. I will shoot the stiffest arrow I can get to tune to my bow. That way I can make them long and use a 125gr broadhead.