Your leaves are showing problems,what they are I dont know but plants that big want food.Pending what you've given so far? I would be at 1/2 cup ish maybe a little less a week of 444 just to keep up with Nitrogen demands.
Ya mould can happen. I transplanted 2 gallon pots so I had to cut a slit in the sheet for the stem. I used masking tape and after 2 months I noticed a little on the tape. Perhaps next time I’ll use tuck tape.
I used old bed sheets over my sips. The sheet had to lay right on the dirt to be effective. So pots need to be over filled or mounded. Any little gap and they just multiply.
.4 ish EC until you get a good amount of roots coming out the bottom.At that point its an adult then move up around 1EC.
Ive hit em hard at the beginning before, didn't notice much difference.
Figure out how much youll use ea day then do the math.A standard group 27 rv battery has approx 100 amp hrs.You dont want it to drop more then 50% before re charge.