Helter Skelter help
So I'm trying to get the "I GOT BLISTERS ON MY FINGERS!" achievement and I finally figured out the drum rolls at the end, but the drum roll on the outro I cant seem to get. I have practiced it over and over at 70% speed, got 100%, 80% speed, 100%, but 90% and full speed, I screw it up completely. This is the only thing preventing me from getting this achievement. Is there something I'm missing, some sort of trick to it?? HELP!!!