[{HVY-E}Jinxx]

Thanks, but it is impossible to use trim with level stabiliser applied. And without it I can't make the plane fly straight only by using trim, and even throttling engines differently. Besides in stock planes it works flawlessly without trimming.

So the problem is not solved by trimming

Yes, it does work. Just on a much smaller scale so you can make much smaller adjustments. (Just like when in the bomb site).