Take a look at my elevator setup article ([link=http://www.rcuniverse.com/magazine/article_display.cfm?article_id=486]HERE[/link]). I specifically show Hitec, but it works with all servos. The absolute key is getting the mechanicals perfect... do this and you will NEVER have elevator half problems again....

I have never used sub trims even once on elevators, even on my JR8611 equipped planes. Touch sub trim and you blow your symmetry
DP