Before you upgrade the tires, have you considered cutting down your bump stops? I just did that on my VX last week, and the difference in ride quality is AMAZING! I was considering going to Rancho shocks to see if that helped, but now I realize the stops were the problem. Do a search if you're interested, I'm away from home this week or I would post pics myself. Very simple job, just need a wrench and hacksaw and away you go!