Alot of people seem to trash Mech heads on here. With your setup Id use the Rocky mountain Snyper head if you want mechanicals. I used them last year w/ great success, they have great penetration and accuracy. Two of my kills w/ them were over 35 yrds, neither animal went more than 30 yrds after the shot. One ran straight away and had blood spraying out both sides... That model doesnt take too much energy to open so it would be good for your setup. I'd never recommend the "over the top" opening type. No matter the setup.

I carry both Rocky Snypers and Magnus stingers in my quiver. I spent lots of time tuning my bow and can get both heads to group together at any range.. I dont know which I will use this year... probably the Mechs for deer and fixed for bear.