Overcontrolling
A point that hasn't been mentioned is - BALANCE!
Remember that the further effect of yaw is roll and of roll is yaw. Make sure that you are not dealing with the further effects with the incorrect control. Quite often small amounts of yaw are not observed and only the further effect is detected. Applying yet more aileron will of course create more yaw and therefore further roll leading to excessive use of aileron with may still appear as insufficient leading to frustration and overcontrol.