i think it could be down to tyre size (a bigger contact patch means there is more rubber on the road to follow imperfections) as i had the same size on my rrc.
my rrc came with 205,s as your had and i fitted some freestyle alloys with michelin 235,s on and noticed it slightly following ruts etc
then i put the 265/75,s on and that did make it very eager to follow ruts/overbanding etc
are the tyres you