I have recently built at Thunder Tiger Seamaster 40 plane to fly off my lake in Montana. I have had a couple of flights with it so far and have found that to fly the plane level I need to apply almost one half up elevator. I have moved the CG to the furthest back recommended location which seems to help a bit, but even when I am reducing throttle to come in for a landing I need to use a significant amount of up elevator to keep it level. I am using a OS 46fx and the battery is mounted behind the servo compartment.

Do I need to adjust the angle of the engine thrust as well, or should I continue to move the cg towards the rear? The plane was an ARF so I assumed that the stock thrust angle is correct.

I usually have a lot of spectators watching me (my previous float flying experiences were highly entertaining!) and the porpoising flying nature of this plane is not making me look to good!

Any insight would be appreciated.