I have a kangke 60 size extra with a .91 Tigershark. The motor runs good but doesn't make much power so I purchased an OS 91 fx. To be honest the Tigershark was the first .91 size motor I have ever seen and when I got the OS in and looked in the box I was floored by how small it was. It has to be a half pound or more lighter than the Tigershark. My question is would I be better going with a 1.20 saito or os fourstroke for balance than trying to move everything forward to get this to balance. Also.... how far off of the leading edge would be a good 3d balancing point. I have flown this a lot and I love it with the balance point right at the fattest point of the wing but I am ready to start moving it back anyway. So I guess my question is how would a Saito 1.20 compare with this mammoth Tigershark .91. I kinda want a fourstroke anyway but my main goal is to start learning some 3d maneuvers.