This is a fairly common problem.
A good fix as I know it is to put a small rubber "O" ring as a washer on the screw that tightens the lens down.
Talk to lewster here on the forum. He not only has the right size "O" ring, but also has the exact size and length stainless steel screws. Not sure on the 08s, but for years the screws would rust out. Since getting the rings and the screws from Lewster, my moisture in the lens area has been significantly diminished and in many cases, a complete non-issue. For the few lights that still had a slight amount of fog in them, I traced it back to the styrofoam like base that the lens sits on.
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