Yep, 4 1/2 " is correct. High rates should be all you can get, and low rates almost half of that. I have my CG also around 6" but it really is very very pitch sensitive and hard to land. When flying to slow, it automatically wants to go into a hovering position, which is cool as long as you want that. I would start out as recommended putting it at 4 1/2" and then work my way back as you feel comfortable and get to know the plane. Here s mine :