In your situation I would look at a tank and a cheap battery operated timer for irrigation, or you can at least run straight water from a hose. You can do a passive system really cheap or go high tech.
If you are missing the morning watering in a hot climate, I really suggest this.
Your mix and fertilizer program can also be causing BER. In container gardening antagonism between elements is real, but still less common than a lack of an element when we see observation of an issue.
I'm not sure what you are thinking with mulch?
Good luck
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