the only thing i can say on your question is it could be the balance point of the arrow, but that souldn't be it with 100 gr and 4 inch vanes. 4 inch vanes on carbons should control any broadhead out there, the carbon strighten out faster out of a bow. Do the arrow have stright flitch on them maybe they are not spinning and the broad heads are picking up air and planning, but who shoots deer at 50 yards. The reason Blazers work is because they are higher and lots of area to pick up air that you need for the back of a arrow. We can get away with it now days because of the drop away rest. always remimber when you put broadheads on you now have fins on the front of your arrow and if they don't come out of the bow stright thay also will pick up air and push the nose of the arrow up,down,lift or right