Sounds like your c.g. and weight should be o.k.. Again check to make sure you have enough throw on high rate elevator. Also, I forgot to mention. Use a prop with the max diameter you can for your engine. The pitch should be no higher than about 6. This way you can get more airflow over the control surfaces to help stabilize the plane. This plane was very stable in harrier to the extent that I often harrier landed.

Greg