Hi Mat sorry its took so long to get back to you, Ive been in Milton Keynes since last Sunday night!
Like Craig said I ran the long top deck because when I tryed them both off the track it made the car have less flex which I thought would good as the car has lots of steering
but since Coventry a few weeks ago I'm now running the short one
which just seamed to give a little more steering when it was slippery!