I am having mixed results with the 85gr. i think my arrow is a little light though. i'm going to try some new arrows and drop my poundage a little and see how they do. My set up is a PSE Fire Storm Lite @ 62lbs, 28in. gold tips,85gr sonics, wisker biskit. Anyone know if i'm right in trying these tuning alternatives to "stiffen my arrow spine" before i give up on the sonics. I realy like theses heads and hope i can get them to shoot. Didn't mean to take over your thread WIS, I agree with you that these heads should do it! did you see the video clips on ABC's web site? AWSOME