ffdg,

Hi,

Try moving the CG back to 3 3/4" to 4"; 3 3/8 sounds as if its too close to the leading edge causing your bird to be tail heavy. The worst model I have to CG is my KMP Hurricane; I have a Magnum 1.2 in the nose with a Dave Brown spinner; I still had to add 19oz of lead to the nose before she would balance correctly to include moving the flight battery under the fuel cell.

Brad