It sounds to me that moving the batteries too close to the ignition is what the gremlin is...

I have a similar setup but using 4000 mah lions and aluminum spinner... I had to put the battery just in front of the wingtube... You may need to add some more weight in the nose and move the battery back...

Replave the spiiner with an aluminum one and save the CF for a CH Vision 3D... a plane that is actually noseheavy and will benefit from the light spinner...