Caster if not adjustable from the factory so to increase caster the answer is yes. In an OE height car the rear camver bolts should bring you very close to the desired rear camber spec. Once lowered, you'll need the Pedders rear camber bolts.
Our 32mm rear bar with the 1LE 27 front is pretty amazing and a bargain given the increase in performance.
After that, coilovers with camber plates.
Does this help?