Quote from Forbin :

Don't worry about the adjustment angle. The only thing that matters is the live angle.

Different camber on all 4 wheels is nothing unusual, especially if all the fast corners are lefts and all the slow corners are rights (for example).

The most accurate way to test an endurance set is to drive lap after lap until a tire blows. Then make your adjustments and do it again. The best set is the one that is both fast and lasts a long time.

The driver can make a huge difference too. In the 24HR race at Aston GP (AS5), we (CoRe) ran in the GT2 class with the XRR. We had a set that would last rcpilot and me at least 23 laps, but one of our drivers popped a tire after 18 or 19.

Tyre wear and tempratures depends on more than just wheel camber, things like the roll center, camber links (length and angle) the weight distribution, drive layout (4WD, FWD and RWD) and most of all your particular driving style all come into play, everybodys driving style is diffrent some ppl are smoother than others which means they are easyer on their tyres which keeps the tempratures down and increses their life.