I had one of the matrix...fly reaLLy well snap so good ....i agree with the instruction sucks...i got a shocked when i read thru it and its 10 - 11mm from the leading edge....anyhow i set mine with 90mm and its a little heavy on the nose...built alot of right thrust on mine and it fly better...i uses a magnum61 mount it all the way to the front of the mounting.i gor mine with about 1 to 2 degree of left thrust. will definitely move the CG ....