I use to have the tower tranier also, but I put an O.S. 46 in it instead of the tower. I also put a 11x6 prop on it and that did slow it down from the 10x8 or even a 10x6 prop. I would try the 11 inch prop and see if that does help you out and also like others have said the wood props are easy to break so you may want to go to the plastic ones because they really do take a lot more "ground touch" than the wood ones do. I do fly both wood and plastic props on the same plane and I do not see any differcence in them as to how they both perform.