Fighting the kind of humidity that you have to deal with I would keep the plants spaced nicely and try to grow them on a trellis instead of caging or staking. Keep them pruned enough to allow air flow. Make sure to water well during the early stages of blossoming and fruit set and water often.
Since most summer days here have humidity nearly 100% the biggest problem is disease and I would think that will be your biggest problem. Keep them sprayed for diseases and insects which spread them. The very best tomato of the hundred I have tried in the heat and humidity has been Big Beef. I call it my insurance tomato because if I put out a couple and keep them sprayed and pruned a little I am usually rewarded with a decent crop from them even when the conditions are terrible.
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