I personally think you're bottoming out, so yes, I think you'll be happy with more preload. Find a little circuit you can run - I used a 200-yard stretch of waterfront with a lot of bumps; and start changing things bit by bit. If this is true, what you really want is more spring rate, but without changing springs you'll have to add more preload and live with *less* sag. Downside is the bike will top out over potholes, but that's better than bottoming out over bumps, usually.
The stock spanner needs to be fitted on from *above* the collar to get it to fit in all the grooves properly, you can't just hook it on from the middle. Yes that's a PITA, but it keeps it from coming off. I personally use a more standard shock spanner wrench without the middle bit, because I have one laying around. Makes it a lot easier. If you go in from the left side of the bike, access really isn't that bad, and mine is actually quite easy to turn with a reasonable (8-10") long handle.
Last edited by kevin_stevens; 05-04-2010 at 08:38 PM.