With the xxx-s, you need thick hex hubs for 28mm wheels. You can use either the AE graphite ones or the AE FT clamping ones. They are a good bit thicker and will give you alot more clearance between the shock eyelets and rims.
The problem with unequal steering on the xxx-s is the result of poor design. Look at the draglink. See how the ballstud on the drag link is way off to the left side?(looking from the rear diffcase). I corrected this by finding the dead center of the draglink and drilling another hole there. I put the ballstud in that hole and installed a long-style ballcup used for camber in offroaders, and a standard RPM short ballcup on the stock tierod. Works great, I get perfectly even steering. I have heard of some people putting the ballstud in the right hole(again, looking from the back of the car).
Make sure to check your tweak also.
Hope this helps.