I have built a Top Flight plane kit, the Contender. The plane looks great but .. it would never like to fly level. Give it a bit of throttle and it would nose up and starts climbing severely. The more throttle and speed the harsher the climb. The plane was built as per specs and drawings .The C.G is spot on as indicated in the instructions book . I did try to bring the C.G. forward and backward the design point however neither would improve the climbing trend. The engine was tilted downward by placing one washers on each top side of the mount ,then two and finally three washers and that seems to have improved the situation just slightly .However the over all flight characteristics is really not good. I can not think of anything else to do. I would appreciate it if you could give me any suggestions that might help please .Thanks.