Pete,

The engine should have a little down thrust. I have only set up the XL's but each one of them has had plenty of down thrust. If it climbs when you increase to higher throttle settings you will know you need to add a couple of washers under the front mounting screws (or just adjust the engine in the mount)

David Reid

P.S. Good luck with it you will love the plane. Perhaps the most noticeable thing about your first takeoff will be how quickly it comes off the ground.