Before you do anything else, I would recommend you ensure you have the correct type and amount of fork oil in each fork leg. The best way to do this is to dump the old stuff out, and refill with correct amount of new stuff, which should be down every 2-3 years anyway, regardless of use.
As, r_outsider mentioned, these damper rod forks aren't very compicated, and there really isn't a lot to wear out. There are really only a couple of holes in the damper rod, and they really can't wear out. Mostly, things usually get plugged with crud over time, which tends to make them harsh.
Based on how you are describing the problem, I'd be concerned that you don't have the correct amount of oil.