Too hot for spinach and lettuce now.
How much is it costing you to put that much water on the garden?
Plants that get stunted early will not produce, no matter how much water you use.
I would suggest you go to native seeds search and find varieties suitable for your area. I know they carry tepary beans and different varieties of corn, tomatoes and peppers as well as different melons. Look for greens that were not developed in cool moist climates. Did you know you can eat tumbleweed when it is young? Some of the amaranths should do well for you. Instead of trying to adapt the garden for plants unsuitable to the climate, try growing plants that are adapted to the climate.