I run 245/40 9J ET40 front with a rear 215/45 7J ET43. The front clears fine but does catch on the arch liners, personally I've left it and just let it touch, I don't think it's dangerous just a few marks on the tyre and liner where they sometimes contact.
On track I found the stagger to be interesting to drive, my car has coilovers and has been corner balanced with -3 deg front camber and -1.30' deg rear camber. It seemed that the front just had too much grip and was either causing the car to understeer and run wide, this was with AD08R's and a passenger.
It was also my first time driving on the this setup so I'm not sure if I expected too much, to be fair it turned in well and seemed to corner well overall but I expected more, let's say it's not an easy drive. At one point the car lost grip after I turned in at 90mph and the back end just came round before I even realised that it was going and was too slow to catch it, definitely lack of experience and I took the corner incorrectly but it just seems too much to me unless you're doing time attack or something. Although it could have been my car tripoding.
I'd recommend a less aggressive stagger like 8/7J, with 235/225 and 215 tyres for track or a square 235/225 setup with a thicker rear arb and a geometry setup that will allow more rotation.
The other plus side is though that stagger looks epic