I am not a suspension guru but I have lowered my car...Tien Flex 1st generation.
I expect 10% treadwear loss due to out of spec camber. I am installing the 350EVO front upper control arms to aid front end alignment, but passed on installing any arms in the rear until Hotchkis releases thier adjustable set.
My car is lowered about one inch...cheaper to accept the treadwear loss IMO.