Yes, but make sure you don't have binding, or re-ihhing it. Set up dual rates so you stay ahead of the plane during regular flight. Since you fly 3D and helis you should be fine. The plane will have some stall characteristics that are different than 3D specific planes.
Some 3D trim tips at th link below will help you.
http://www.horizonhobby.com/Explore/...ArticleID=1322