personnally i think you never need too run a oneway in the rrr, just done a national in the uk, its pretty much the fastest flowing track in the uk, you look at the track and think deffinetly use the oneway, but the solid axle was so much better.
i'm also finding the car is at its fastest when the tyres have worn too a 1mm split (using 23t pulley) instead of the recommended 2mm, anyone else found this