Well reading through this thread has been very interesting. I've just been playing about 2 hours of this challenge so far, recording for Episode 2 of my 'Rookie's Guide to GT Academy' series, and at several points I actually checked the tires to make sure they were racing hards - I had NO grip at all. Literally none.
It felt like I was on Soft or even Comfort tires.
The car really doesn't feel like a GT3 car at all. I remarked in the recording that surely GTRs are agile, and have good feel. This was just numb - turn in, nothing, understeer for days, then sudden violent oversteer when you touch the gas. Which at a track like Brands Hatch is just an evil combo to have.
Hence, the censor bleep will be being worked overtime in my video...ended with a 1:26.129, which I'm still pleased about, but that came with a LOT of retries. And now finding out the grip was likely compromised has annoyed me further...never mind, more speed to come next time I have a tilt at it.