Well, my
request for help apparently fell on deaf ears, but got me thinking. After fertilizing Friday the necrosis hasn't progressed, and it appeared in the last few days between application of the Geoflora. The damaged leaf tissue is limited to the middle of the plant and I think the flowers are cannibalizing the leaves for nutrients, so I think a half cup of Geoflora weekly would be better than a cup biweekly. That should keep nutrient availability more stable.
All that may be moot, though, as these ladies are getting close to the finish line anyway. Trichomes are getting dense and buds are filling in. I'm projecting 3 weeks for #2 and 4 weeks for #1. Got myself a monster 30x40mm magnifier to make inspection easier.