Wow, outstanding job and results!
BER is more problematic in some varieties than others. If you search the posts last summer, I was having a tough fight with BER, and Ray, Ami and others gave some outstanding advice that worked that you may want to try.
One, shade the base of the tainer with a bamboo shade (or anything you may have handy) to keep direct sun off of it. These were E.T.II's and the IIIs may not have that problem as they are double walled. Along those lines, I also got the tainers off of the concrete with 2x4s to help with root overheating as well. Too much heat on the roots may have interfered with calcium uptake, which seems to contribute to BER. Second, when you water, use a liquid feed with lots of calcium, available at local hydroponic stores. One or both of these "fixes" resulted in complete elimination of BER. Good luck. Can't wait to see the bountiful harvest that is coming your way!
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