recommended shops for alignment near Paoli

[Darren]

Some say that camber is not a big problem with respect to tire wear, but too-aggressive toe and the tire life span can be measured in hours.

I agree with that philosophy.  I run 0 toe in front for that reason and because it's good on the track.  If you get a lot of toe and a lot of camber together, you'll wear the tires out fairly fast.

I compensate by using cheap street tires.  Right now I have Kuhmos on there and they are about $100/each for the street.

The rear you need to still run a fair amount of toe in with the stock bushings because they will go toe out (or less toe in) on decel.  I think you still need to run about 1/8" total rear toe in (1/16" each side).  I don't know the conversion inches to degrees, I'd have to find a chart.

I'm running -3' front and -2.5' rear on a 996 lowered and similar spring rates to the GT3.

Until you get a fair amount of experience though, you can easily overdo it with the negative camber, especially with a really capable car.  You might want to try something more mild and then go more radical as you get faster.