Well, I have no idea what's going on here with my tomatoes, but I like Elaine's suggestion about hybrids. I'm definitely going to get a couple of hybrid plants and see how they fair.
I think containers might be more successful here just due to the problems we face. I don't have a choice, so it'll always be containers for me, primarily earthboxes. I do have some peppers in smartpots now and while they are doing OK, it's just that ... OK. Nothing special and the ones in the earthboxes earlier did much better. Of course, the ones in smartpots were started much later than the earthbox so perhaps weather played a part as well.
I've also used hydrogen peroxide diluted in water when watering seedlings. I'll probably douse the new hybrid plants with it when I get them and hope for the best. I know NewYorkRita posts a lot on another forum and she grows primarily hybrids in NY. I may have to adjust my thinking here if I want any tomatoes at all.