Is this all going on on the ground or is the plane doing this after lift off? I had a bipe which on lift off had "0" aileron responce and had only rudder control until the plane got some speed up, tail up and got moving. Quite nerve racking. It did not last long, but your post reminds me of the situation I had. Something to consider is during takeoff you may be getting into the rudder on throttle transition a little which will cause fits with a shorter coupled plane. Hope this helps, Walt