Yeah the kangke cap was a little on the heavy side. Powered with a saito 220. It is a great combo. Auw 13lb 14 oz. In an attempt to set it up for better 3d, I borrowed it for a week to put it on a diet. Got it down to 12lb 9oz. In the process moved the cg back a bit. Plane flew much nicer with the weight reduction but we had to put in more k-edge mix. My father flew it and for him he is a bit uncomfortable with the rearward cg so we moved it back foward. Needed less mix. I'm no expert at aerodynamics, but I guess this is a bit weird. I just assumed it was one of those crazy tendacies of caps people talk about.