Try greasing your outer-tie rods, they are re-greasable. Plus 1 on the front sway bar, I would use white lithium grease, from my experience when your ball joints start to go, they tick.
Try spraying the WLG on your A arm bushings. There are kits you can buy off Ebay that replace all of your bushings, including the rack pinion casing bushings, when those go bad, your wheels will start to rub on your frame when you turn the wheel completely left or right.
Also, your rotors could be glazed, from having some kind of grease on your rotors. Check your brake pads. Are they shiny and completely flat. Your rotors would be shiny and glazed looking as well, when you hit a bump, that could the rotor hitting the brake pads.