Sounds like something is wrong with your setup. The plane shouldn't be pourposing (sp?) with a CG of 5.0. Heck, I've got mine at 6.25" and it still flys great. Even a CG of 5 is on the nose heavy side if you ask me. I had mine set to 5.5 and still thought it needed to go back. Thus the 6.25" I am at now.