Hi, yeah I had the Slipper and One way on the car - along with the shocks off my 501X. I've driven more dialled cars for sure - it just wasn't amazing yesterday but I'd put it down to the tyres. It was good though and I'm happy with my qualifying position.
I can't say I'd have done better with my 501X but it's certainly more finely adjustable and tunable a race car. I'll get some new tyres if I go to York with it next weekend