You are pretty far south and so fusarium after the last two very warm winters is a possibility. Have you tried growing a hybrid that is resistant to the three races of fusarium to see if it does okay in your ground? If you can get an Amelia tomato plant and it does well then you probably have fusarium or nematodes. I got some Amelia seed and Multifort seed to try grafting onto them as a last resort to help me with my dreadful fusarium problem.
Bill
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