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Hi,
Have you ruled out early stage broad / russet mites?
Doesn't look like you've got any of the other symptoms ... but twisted leaves (bending sideways, like yours is) is one of the signs. Brown/dead spots emerge as bugs proliferate ...
Bugs are difficult to see under the naked eye (and under scope) .... best scope up underside the leaves at 40x and look for clusters of eggs ...
Doubt it is ... but good to rule it out. Sincerely hope it's not though
Hi Dan
Gotta say, when I looked at your photos, I did notice some of the weird leaf withering one side ... it does look a bit like this!
The good news, apparently (never had this problem) is it's not a bastard to cure.
Couple of people swear by aspirin (!!! seriously !!!) - both as a foliar spray and as an additive to their usual feeding / reservoir. I think the ratio is c 120 mgs aspirin per US gallon for either treatment.
Good luck ....
Did the aspirin work?