I have this one balanced at 5 9/16" I've been back as far 5 3/4". I like mine better at closer to 5 1/2". It makes it easier to hover back a little bit, but not much. It hovers easy anyway. I think is spins better a little further forward. I also think it KE a little better at a 5 1/2" or there abouts. So if you want to hover move it to 5 3/4 - 6" if you want to spin or KE keep it around 5 1/2 - 5 3/4. But this plane is very forgiving on CG. Any old place in there will work. It still lands easy, especially if you use spoilerons.
Have a great day!
thanks
Barry