Um... if you want critical... don't visit Joe's tire shop. Visit an alignment shop.
Custom Alignment in Mountain View, it's 2 hours of labor but they will pretty much take apart your suspension and make the alignment pretty perfect.
I had an E36 M3 which was stupidly sensitive to alignment. I drove a 70 mile commute. If the toe was off more than .2 it would pull or wander. CA nails all the alignment numbers and even with stuff like caster being off by .1 they will disassemble your suspension to get it to match the other side. They are crazy obsessive which is a good thing and may prove helpful.
Before you start throwing parts at it, get the right diagnosis of the issue.
