The leaves I sampled were indeed kilned for 4 weeks at 128F. Is this an appropriate temperature?
I had my soil tested at the beginning of the season. There was nothing too surprising or out of whack; nitrogen was a bit low, so I added some 'natural' type fertilizers and compost. I had read that tobacco really likes potash, so I periodically added kelp meal and other slow-release amendments that add K.
If any of you 'experts' are willing to play Dr. Tobacco, I'd be happy to send some samples for comment and/or diagnosis.
I'm honestly no sure what I would do differently next year, and you know what they say about doing the same thing over again and expecting different results.... :-(