Like Ed Cregger, I have loved all the Kaos's I have owned. I set up the Tower Kaos exactly per the plans as to balance. I use all their hardware
including the tank and wheels supplied, and am extremely pleased with the performance. They are really easy to fly, and the only thing that keeps
them from the trainer category is their speed. They are a pretty quick plane with a good 46 (such as TTPro or OSAX). Good luck. As to wing and horizontal anges,
have not experienced any proglems, and my friend and I have assembled and flown several of these planes.