One problem may be too many growth tips. Lots of stems will result in lots of blooms on most of the suckers and stems but usually I get very little fruit set when I allow too many stems to grow. I rarely let a plant have more than three or four stems. Another thing that will cause blooms to drop without pollinating is if the plants get too dry. The stress from that seems to cause a lot of blooms to just drop off. This is something I see during times when I am trying to lessen the water intake of my tomatoes to get better tasting fruit that is at the ripening stage. When I cut back severely on the watering to benefit the flavor I get a lot of blossom drop from blooms further up the plant. Of course extreme heat and humidity will lessen fruit set also.
I have found that weekly feedings of TTF helps my fruit set even in the hottest weather. Mulching the tops of the pots with a heavy mulch to keep the soil a little cooler and the moisture level more stable will also help.
Bill
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