I have a Mini-Edge 540 built from a Hobby Hanger kit. I am using an O.S. 15 engine. The plane wants to hop coming out of a corner. I had to build my own motor mount to fit everything in the cowl. I am sure the plane is not tail heavy. It also tries to go nose up on aproach or into the wind. the plane doesn't take any unusual trim to fly straight and level. Flying into the wind is easily correctable, but landing is tricky. Anyone have an idea what could help?? I thought possibly a touch of downthrust?