Beachwalker
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frankly I don't really pay too much attention to vpd because in my opinion at most it may slow down growth a bit but I've never seen it have an effect like this on a plantI could totally be wrong, I'm just going by Ye Olde VPD Chart of Googling.
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If that's right, then the protective wax has been stripped from the leaf tips. Maybe exacerbated by the thrips and overfeeding?
Have had humidity in the low 20 sometimes and yesterday my temperatures were 88° and my plants are beautiful
I think it might possibly be something fungal or bacterial like Mr chemistry said, depending on what OP's next slurry test is. This is a bit of a puzzle