I just had a thought. Make sure your nose wheel and rudder are aligned. If you're driving down the runway using the nose wheel to keep her straight, as soon as you lift off the rudder takes over and could cause adverse yaw. Not important with a tail dragger but something to think about with a nose flopper. Also spend some time with your trim making sure the ailerons aren't trimmed to one side to compensate for the rudder being out of trim to the other side. I know this is a hard one to spot so get some help from an experienced pilot.