Hi! Oh yes you need a bit of right thrust but following Chip Hyde's theory you don't need one.... Because on inverted it becomes left thrust...So best thing you should do is to use some kind rudder mix...and bla bla bla...

Would not rather to confuse you but you will find lot's of theories, the most practical trimming charts I have found are from Pete Goldsmith's trimming article and Mike Chipchase's K factor trimming article from the 90's.

I have full respect to other people's theories but seriously we do not have enough time to make all these tests, clock is ticking and we must start practicing...

Catch you later,

Nikos