Hello,
I'm not sure if it is a good idea or not, but why not put 4 more solid bolts on the corners to hold down the weather cap. If you screw the middle of them too tight it seems the more the corners raise, granting access to water and moisture. I know you have done many dunk tests to see if they are waterproof or not, but I have been experiencing more moisture problems over a few months and was just wondering if this might be an idea to pursue.
Thank you in advance,
James Hindley
Central Coast Communications Society
http://www.belco.bc.ca