I suggest starting with using only elevator first to work on getting your timing down. And if your roll rate is too fast take some aileron out. I have a rolling harrier setting where it is agressive tail movements and not so much aileron. If you use only elevator though for practice you can work on throttle timing as well and not add another element (rudder) to the equasion. Hopefully you also notice your elevator timing also steers the plane. Once you have this start adding your rudder and watch how it all smooths out.

JP