Had a similar prob with my son's MK1 FRS.
Couldn't get the camber right on one side. Pulled the shocks off in the end and found one of them just slightly kinked where they enter the hub. Dunno how it get bent there, maybe a clipped kerb. You couldn't see it while it was on the car but as soon as you took them off and put them side by side is was obvious.
Got a 2nd hand low mileage set and fitted them and it was spot on