I don't mind them hairpins in XRR all 2much anymore. Last 2-3 races I did with it were full of them anyway.
25-30kg is 2much of a ballast with 23%. Just feels 2heavy, 2 slow and kills tires 2much. 15-20kg next up whilst still shooting to reach that 42.5.
So, here it is: 15-20kg is perfect. While 15 is little bit too fast, 20 is little bit too much bare for tires and slightly too slow.
Let's say 17-18kg with 23% is the perfect measure for XRR on this track is my conclusion from all the testing so far.
This of course makes it more difficult to make setup for XRR with extra ballast on. Still, I think r2r2 should be very possible on it, while not really possible on FZR with slight chance that it is possible on FZR. So, that's to be tested a little bit. If r2r2 race set can work on FZR, then XRR's ballast needs to drop to something like 10kg.
There is obviously the other way. Making the restriction just engine on XRR and then engine+weight restricting FZR+FXR, but that would be ludacritious, when those two cars are already balanced with each other and will be used far more than XRR. And there you have it, I recommend FZR: 20%, XRR 23%+18kg and FXR 23% for GT2 class.