You are attempting to water stress your plant in order to produce a superior taste, is that accurate?
As I said earlier, do share your results and don't let a "Shelton rant" rattle ya. However, do keep what Sheldon and David wrote in the back of your mind because you will see what they are talking about. You are digging a container in the ground which is not the best route to go for a number of reasons. Also you are not truly dry farming, you are just restricting water, which w/o a cover to control the environment is worthless. Humidity is another factor. You must consider the plant's water use efficiency and the plant physiology. I believe you should expect more BER in this experiment of yours. Personally I think your taking the wrong approach to improving tomato flavor. I am of the opinion it's not the water... it's more genetics and nutrients. But experimenting is fun and one way to learn.
I assume you have your soil test results to guide you before you start digging these container holes in the clay soil?