I have 20 tomato plants in our garden and three container plants on my deck. All plants are doing great - health wise - and are growing strong. That said, we're not setting as much fruit as I would think for plants this size (all plants are at least three feet).
I live in Ohio, so it's still early here, but I have seen dozens and dozens of blossoms dry out.
So, I began to fertilize with a mix of phosphate and potash (cutting out all nitrogen) and have sprayed that blossom set spray (the hormone spray).
I'm curious though, what specific steps do you take to help promote fruit set?