I have been playing with this a little. I actually ran fully long at Stotfold for the national as it was way better on the bumps like that (driveshafts straight) I am going to play with it long at other places this winter as well as the rear suspension is much more consistent between on and off throttle feel with it on long and traction is no issue with the 4 gear tranny.
Having said that on a slick track short is good but that doesn't mean run it everywhere...........Chris