HAHAHA this setup is a laugh around Motorland the rear is still terible but you have seemd to get that under controll i like it try tuning it with a GT Wing added downforce
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As we speek B-spec bob is doing 8'20's around Nurbürgring with this setup in "Reduced pace".
Tire wear seems to be even on all 4 wheels at the beginning. On the 3rd lap the back wheels start to suffer. This could maybe be reduced by backing down to stage 2 NA tuning (-80 BHP)
If you don't like the oversteering, try softening the back a little. I haven't tried it but it could work.