I have exactly the same plane(ARF)engine......also had the same problem.I moved the batt. behind the servo tray and problem solved.I used a piece of velcro to secure.
She flies real easy.......fast with the .46AX......a big change for me from the SuperStar......but lots more fun..........try that before butcherin your plane all up.my CG was exactly as the book showed...2 15/16 from LE.....