Have you tried Manalucie Tomatoes? They were developed for FL heat and humidity. U of F I think. It's an old, old pollinated large tomato. Old time flavor.I have not, and would be open to trying. Besides the heat, the other issue here is poor soil. I only know of one large fruited heirloom tomato that likes it on my farm. Otherwise I have to depend on my wild tomatoes. I’d love to figure out other varieties that will thrive here.
I’ve tried Cherokee purples here two years in a row and it was a waste of my effort.