You've got the right idea. Lots of speed, and lots of altitude.

Once you roll to 90 and apply the rudder, there's no telling what you will need next. I've had some planes that held it beautifully without any other inputs, then again, some planes will require to hold a little aileron, some will require some Up Elevator, and some will require some Down Elevator. Every plane is different (Some 4*s will even be different than others). So keep it high, see what it does, and be prepared to roll out level again. Each time, add whatever input you discovered it needed from the last try.

And remember...

If you get in trouble, ROLL your wings back to level!!!

And if you are headed earthward, CHOP the throttle! (You can pull out at low throttle much faster than at high throttle)