Actaully out of all things..I finally learned to apply the rudder with better precision was
after I started doing knife edges then going inverted.

Oneday I was flying around only going inverted 10-15 feet off the deck only on a straight path...thinking
i was all that.
My instructor told me ...I still sucked..lol
He said try going inverted completly without rolling back.
So i took the model 3-4 mistakes high and start praticing using the rudder during banking
while inverted.lol