I am kinda puzzled... It was about 85 degrees last weekend so it took its toll too but as today I swapped out tires on a car I see that my rear A6 got pretty well eaten almost to the point where band of vertical lines starts.

you can see on attachments - last picture on the right side shows front outside and front tires wear is OK on both sides inside and out, no complaints.

Rear inside wear is OK as it should but rear outside IMHO is eaten up way too low. Tires were at 38psi front, 40psi rear, camber is 2.2 front, 1.9 rear. From what I understand this camber should be adequate for sliks.
It is third event I used these tires on and it is first time they got eaten - but it was HOT and I was cornering quite hard. I also noticed that my *** was quite loose - no wonder why now. But why rear outside got beaten so badly? It is typical for Hoosiers?

Rear sway bar is from GT3 at its medium setting. I tried it at firmest setting on a previous event and did not like it much - rear was quite unstable, too much oversteer. But wear marks were not as low.

Does this wear signifies that bar is still too stiff or otherwise? What would be the problem here? Car is 997 C2 with stock shocks so far, I will put JIC Cross soon with 8/11kg springs, front sway bar is also stock. So, does it mean too much roll in rear? Or shocks too soft? Or what? How to fix this?