Do not water while the lights are off. BAD IDEA. The plant needs complete relaxation during its downtime. Feeding is for the daylight hours...best for bud production.

Are you putting your plants into 2 gallon buckets with drip system? What is your layout? Post a picture so I can comment on it.

Just be aware that ebb and flow tray with drip is a bad idea. You need to have a way to move your plants around a bit. Just my thoughts from my drip system grow experience.