The buds have really grown a lot since last update. Looks like the growth has completely shifted away from leaves and toward growing buds. Nutrients continue to get sucked out of the leaves as they yellow and fall off.
The tape around the sides of the cup seems to be holding up and definitely keeps the moisture in for longer, but I'm still having to water every day and am testing out watering/feeding twice a day now.
During flowering, I've only been using Advanced Nutrients organic Iguana Grow. It's meant to be used with a zillion and one other Advanced Nutrients products, but I got sick of all the measuring and am keeping it simple.
Lower leaves are definitely dying, but bud growth seems to be pretty good.