CLa, you state:
"Drainage holes are right at the bottom plate line where the mix is resting."
Is your box level? I had a similar problem with mine last year because they were not level and part of the "plate" set in water soaking up way too much into the mix. I drilled another hole about 1/2" below the original, leveled up the box, and once the mix dried out my plants were fine. Try it, all you will do is reduce the water storage capacity is a little. ☺
Red
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