In the 'let's water a bit more' spirit, decided to give the grapes another dose of water (4 hrs drip) . In looking through the vines, I noticed a very unique leaf patter - not straight-up dry, but a weird coloration / drying pattern. Referring to my trusty UCD guide, it looks kinda like potassium deficiency. More investigating and soil ammendments to come post-harvest.
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