More speed = more lift -- always. Trim it so that it flies as you want, at the power setting normally used for most of your flying, & do it by adjusting the elevator clevis so that your Tx trim is at neutral. Don't mess with the incidence, or thrust line (at least not in the vertical plane), they will be factory pre-set, & the Avistar is very seldom out of whack in that regard. It is often usefull to trim for level flight at ~ 3/4 power, where a lot of flying takes place. This will give your Avistar a modest climb at full power & a modest decent at approach power. If you always fly at full throttle, trim for level flight at full throttle, but be prepared for a sharper decent at lower power settings.