I have a Kyosho Extra 300 that is ready for first flight except for proper CG. It is set up with electric motor (E-flite 32) ESC and 5S 4000 mAh Lipo battery (big as room allows and recommended in manual). The airplane is considerably tail heavy even with battery up against the firewall. in order to achieve the CG shown in the manual, the addition of 10 oz. attached to the motor mount is necessary. Really don't like to add this much to an airplane this size. Has anyone encountered this problem with this particular model? Any other solutions?