Had fun with mine too! Eventually found this on bbs and also a tip to only turn ⅛ of a turn at a time. Now very happy.

Turn screw clockwise for heavier second stage, however if the adjustment has been reset incorrectly this may not be the case, at this point you have to get back to a base setting which does seem to confuse most people.
It may also need some work other than adjustment as it could be as much as 15 years old.

Ben

David