Sounds to me you dont have enough KE or you could slightly be out of tune. I had the same problem for a while before I tried a different broadhead. Then it was consistant passthroughs. Now with my new setup PSE Stinger NI and 2blade Rage I have no problems, of course Im shooting 100% pass throughs cuz I only shot one deer with it last year and it. Waiting to put down another one or 2 yet this year.