does anyone have any suggestions about the cg on the katana s120 . the plane has a saito 180 slimeline pitts exaust  and 16x8 apc prop. the manual says 242mm out from the center of the fuselage and 100-120mm back from the leading edge of wing,with the larger engine and exhaust i was expecting it to be nose heavy, but it is extremely tail heavy even with a 3000mh 7.4v lipo pack sitting right on the spinner. all the other electronics is forward of the cg which does not consist of any significant weight , does anyone else have this cmp model or does any one know if this cg is correct, or does anyone have any suggestions</p>