you will get good pentration with fixed heads. i only shoot 56 pounds on my browning tornado. i shoot 100 grain muzzy 3 blade. i shot my first deer with a bow thursday morning.it was a doe . shot hit both lungs and went out on the other sholder broke her sholder. i had a complete pass thru. i love fixed heads. especially my muzzys. if i were you go with fixed.
GO DEEP HUNT HARD.