Holding the pin on target.
I always seem to be coming up to the target. I think it is because I shoot 90% of the time in my back yard and I draw pointing below target, towards the ground, in case of any accidental misfire (hasn't happened yet) I don't want to launch any rouge arrows into the neighbor hood.
Back to the subject I float, and at longer distances for me I notice a big difference. When I first started getting serious about bow hunting, I tried numerous things to get tighter groups at longer yardages. Two major things for me were floating the pin and relaxing my release hand.