RE: Avistar with OS 46FX climbs by itself.
Make you adjustments with the trim on the radio. If you there isn't enough trim on the radio then use the clevis to adjust the throw for the elevator, and then try to use the trim on the radio again. Then, once you have the plane trimmed out mechanically adjust the elevator to set in the trim. You want to adjust the elevator so that the trim tab will be pretty much centered while flying.
Ken