I think the real clue with the Opalka and Druzba is that they are only getting 3 hours of morning sun. Does that mean they are getting shaded the rest of the day?
If the plants are not getting enough direct sunlight I would expect the leaves to look smaller and strange. Opalka has wispy twisting and turning leaves anyway so that's not abnormal even with 6-8 hours of direct sunlight. I never grew Druzba so I don't know what leaf normal characteristics they have.
The interveinal chlorosis could also be related to the plants not getting enough direct sunlight and not a lack of nutrients themselves.
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