I'll echo what SS904 said. A revised compression stack will make a noticeable difference (performance and ride) regardless of whether comp/rebound is adjustable or not. If you're opening the forks up for servicing, do yourself a favor and spend an extra $120.00 to install a Race Tech comp kit. It's the cheapest and most effective performance upgrade you can make, more so if you have to have the forks apart for servicing.
Scott L.
Scott L.