The anti spin devices don't have a thing to do with going down the runway straight, I keep mine on for the slow landings. I moveed the engine a little when I installed the Saito 56 4 stroke. Mine rolls straight for about ten foot then she's off, it used to always go to the right alot.
Britbat you forgot to give me your opinon on the wing thing. One thing I have learned is do whats best for you and learn from mistakes. I am fixing to modify another one so it should look even better. I just need to learn to cover one a different color, I like yellow and red.