rinoldi

The rudder on a Cub is powerful, you do not need "a lot". You do need to use rudder, however. I recommend you not program in rudder to aileron, just use the the left stick in the appropriate amount to keep turns smooth and without "tail droop". Fly the plane, you will enjoy it all the more.

Rudder at take off is basically to steer the plane, countering the left turn influence of engine torque and P factor as the plane climbs out.

Another suggeation is to set up your aileron linkage with differential, i.e., more up than down throw. The simplest way to do this with separate servos is in setting them up, set the servo arm not at 90 degrees to the aileron horn, but tilted slightly toward the wing leading edge. By doing this, the servo will drive the aileron "up" more than "down", thereby reducing adverse yaw caused by the "down" aileron. Good luck wiith your Cub, it's a good one!