I used them for 3 yrs. with a set up very similar to yours, a 385gr arrow producing 64 lb of KE. On small does I had no problems with pass thrus. On larger bodied bucks, when shot quartering away and when shooting on a steep angle I had very poor penetration. I always had massive entrance holes, but if they are high, it dont matter still no blood, you need the exit hole to drain blood. I shot a nice buck in kansas at 12 steps, quartering away, the chisel point barely broke the skin on the other side, of course if didnt go very far. I did loose a couple of deer, I had on blood to follow due to a high entrance hole and no exit. I think you need more power to use a 1.75" head. I would opt for the 1.25", thats what I am doing after my experiences with them