RE: OK, the 18's are battering my front end...
How many miles on your car? May be time for a front end rebuild. I'm in the middle of putting in a new rack, lower control arms with balljoints, strut rod bushings, sway bar end links, new rotors, trannie flush, and a trannie cooler. Half way though and still tomorrow to go. Jack your front end up and see where the problem is. Grab the tires at 9 and 3 check for play, and then 12 and 6. This should give you a good idea where to look for problems. I know when I replaced the upper control arms it took care of a lot of problems, but 20k miles later the rest of the front end crapped out so I figuerd it was time to replace. Good luck!!