Red Badger, I had the same problem this year: huge jungly tomato plants covered with luxurious foliage, but little fruit. I think I know what the problem(s) were:
- too much nitrogen, specifically, too much compost which was made from principally coffee grounds. Good stuff, that, but unbalanced. It could have used more potassium, phosphorus, and other minerals. The compost needed more stuff like banana peels, a handful of wood ashes, a sprinkle of epsom salts. Or I could have invested in a good, all-around tomato fertilizer.
- Too much water, especially early on.
- Not enough sun, particularly because the trees on the morning-sun side have gotten so big and dense over the years that this spot is no longer the best for growing fruiting crops.
My solution next year will be to use a more balanced compost/fertilizere combo, hold off on the watering, and locate the tomatoes in the sunniest part of the back yard. In the semi-shady placs I'll plant greens which appreciate a bit of shade in the hot midsummer, like swiss chard, which did beautifully for me even up next to the house where they were in shade in the afternoon.
Where are you located?
Your tomatoes blooming and lacking fruit can be do to air temp. either too cool or to hot. Also, as another poster noted, to much nitrogen in your fert. can be a problem.