which way are you facing when you say clockwise? My advice is to make 1/4 turns at a time, you'll notice a difference fairly quickly.
If you turn the truss clockwise enough is it supposed to eventually lay the strings directly on the frets? How much is too much? I want to set the action on my bass low but dont want to turn the truss rod too much.
I'm also trying to lower my strings but at a point where the truss wheel is fairly difficult to turn ... is it OK to keep going or should the truss wheel be fairly easy to turn. Normally I would think that if it requires some "elbow grease" to turn, I should stop (?)
John's situation is due to changing the type of string that he's using, so it's probably due to a change in neck tension. In any case, I always adjust the truss rod before adjusting the bridge height because adjusting the truss rod has a big affect on the string height.