Also, why so concerned with speed??? Any good carbon arrow will be plenty fast enough out of any decent bow. It's not like you're going to be shooting faster than the speed of sound or anything, do the deer is going to hear any noises the bow / arrow make regardless. Speed is not the most critical factor but is one of the most hyped.

I'm shooting good quality carbon arrows at 12.7 gr/inch. I put 125gr tips on them and they seem to group fine. I'm having a small problem tuning the bow completely, but that's the rest's fault, not the arrows from what I can tell.

As long as you are accurate and shoot enough weight to get your kinetic energy in a huntable range, speed is of little importance except for bragging...