have you got any pics Hank?

Sounds wierd as this is your 3rd grow and not your 1st, so you should have things pretty off to pat. I know it is easy to say, but have you checked for spider mite?

the symptoms sound very similar and they are very easy to miss indeed in the early stages - even pro's can be taken by surprise. so get a magnifying glass and check the under sides of the leaves just to be sure mate.