I had a quick blast in the Academy 270R around the track from last night and was about 4 seconds slower.
There is not actually much in it between that and the Supersport with regards to power to weight and I am pretty sure almost all of the difference is purely down to having road tyres on the Academy 270R as I simply could not take the corners at the same speed. It also makes the car understeer quite noticeably compared to the Supersport, which actually balances the whole thing a lot better as you don't tend to just lose the rear because the front also loses grip, making it more forgiving in general.
The thing is though, after 3 or 4 laps at race pace, the tyres start to overheat and it becomes even more tricky to drive than the Supersport.
I had a quick go at tweaking the ARB in the Supersport and simply setting the rear to 0Nm with a click or two stiffer on the front seems to help make it a bit more forgiving, so I think we are going to stick with the Supersport and advise people to tweak the ARB a little if it's a proving a bit too tricky.