I' ve been using the QT 4k since last July and have absolutely no problems with it. I just started shooting BH' s and they are still slice the vanes off one another.

You didn' t say where the BH' s are hitting. If they are high or low, chances are your nock point may have changes because of string stretch. Check it out. If everything is in check with last years settings, sounds like you just need to tighten up your form a bit.