Yesterday I found this very informative youtube video on how to so easily adjust these latches.

And it was a snap. I had been hearing too much wind noise. So will not know how well I did until the next time I take it out, which may not be for another couple of weeks. But how would I know if I made it too tight??? Certainly don't want to break one of the plastic things it clamps to. I think that I have it firm, but not excessively tight.

My 2000 Miata is always garaged with its' top up, and only has maybe 44,000 miles or less :-)