On the Tiger controls being sluggish; it almost sounds like to me that the servo tray came loose?!? My original trainer acted like that and the throttle would work, and then not work. I managed to land ok and then took the wing off to check things out. The servo tray came looses and was sliding back and forth. Now I add a bead of epoxy across the top of the tray and the fuselage sides. Never had a tray come loose since. [8D]