Rick I am sure if you read the book it says to trim the 5000 mechanically not electronically, but i could be wrong its bin a while since I had one. any gyro can be trimed on the radio but for best performance always do it mechanically.
If your gyro system is setup right in heading hold you do not need different trims for the flight condiions. all the condition rudder trims should be the same. the only thing that should be different is lower gains for higher head speeds.
If you have to trim, that tells me one you are in normal mode or you have some kind of mix happening. just my 2 cents