It sounds like you all need to heavily mulch your plants. I have my Julienne tomato's growing outside of my greenhouse. They've gone crazy. They are growing in caliche that has an 10-12 inch thick layer of fresh horse manure on it. I water them heavily every three days. Tomato's love the heat, but you have to keep their roots damp and cool or you'll end up with a long, tall, stringy looking plant with blooms and not much else. I have that problem with the plants in my upside down planters.
This has worked for the zukes and cukes also. Eggplants are so-so.