You will be fine at that CG. I moved my Irvine .53 all the way back on the mount, moved the battery back, and added tail weight to make mine more aerobatic. It flys just fine, just make sure you use low rate elevator on your landings or they get a little bouncy. I eventuallly moved my rudder servo to the tail, put an Irvine .61 on for power bought carbon fiber landing gear, and still added tail weight. Knife edge is much better and it will flat spin like no tomorrow.