I’m assuming you have short draw? I think what Matt said is sound advise, I narrower cut and 9.5’s you should be able to get into the feathers. But pigeons can be very tough. My hunting setup right now is .65 elastic cut 5/8 to 3/8 (16mm to 10mm) with a 11”active length and 7/16 (11mm) steel, this maxes out at full butterfly and sends a sleeping pill. So far I’ve had nothing fly away from it after being hit.