I quit using APC mainly because of the spool up time being slower than a lighter wood prop, its real important to make quick vertical adjustments while hovering down on the deck. When you're only inches from the ground, you want to be able to get up immediately if it should start dropping,unless you want to tail touch of course! My Cg used to be 6 or further back, but I found that it performs fine at 5.something too. An aft CG can be used to compensate for smaller, ineffective surfaces, but with todays 3-D monster surfaces, its not necessary to go so far back(just IMO). I just love the Do, been flying one for 5 years now, I can make it do anything 3-D & some bizarre stuff too, I'm not giving that up, it took too long to get there.