sheptack

I had this very same problem. I added 3 1mm washers behind both left side motor mount bolts and no the problem has all but eliminated itself.

Also. let the tail come off the ground but GRADUALLY increase the throttle and the longer takeoff rool will help. Now if you plan on taking off in about 5 feet and pulling vertical, then you will be "rudder dancing" for the first few seconds especially with a larger diameter prop