ORIGINAL: rik756
BMatthews,
No it's not the same in both directions. It does it very little to the right, but very pronounced in a left turn while holding aileron in the turn. You mentioned having the having the trims crossed up. If everything looks normal (level) on the ground how else would go about checking if you actually had one trim figting another?
The simple way is to do it in the air. Add some rudder trim towards the direction that it hangs the tail low when turning. So that would be left rudder if it drags the tail in left turns. You're adding rudder trim, or rather REMOVING BAD rudder trim to pick up the tail. Then use a bit of aileron trim to compensate for the trim change of the new rudder position. Do this a bit at a time until the model turns equally in both directions.
That should do the trick as long as there isn't something else amiss. With that oversized engine I'd do all this at idle or just above. Then power up and see if you need any engine offset to compensate for the torque. You may be using the rudder to hide an engine problem and it's resulting in your tial sag problem.