With a YS110 mine is flying with about 2.5oz in the nose with a 5 cell batt. and servo in the tank compartment. Are you guys sure you are balancing at the right point. Is 6.5in equal to 165mm? I flew today in a gusty wind, it flew great. She does like to float in a brisk wind on landing. How about airbrakes anyone have experience with them on this plane? If so, how high do you set them and how much elevator trim