Same question as Question 3 just with a photo

Hey dagwood!! first off from what I read above I would at least give them 2 hours or dark a day if not 4 I find to get better results with that. give the plants a lil rest. it also looks to have something to do with your watering system, either it is overwatering. or not enough but I'd lean more to the over watering due to where you said the "lightest" one looked the best. it's good to let them dry out like that before they get another watering. Also looks like a slight nitrogen deficiency nothing much tho so I personally would bump up your base nute just a tid bit like where your running 1.25mL/gal Id go up to 2 or 2.25 and see if that helps if it does not then go just a little more just try not to over do it lol hope this helps Happy Growing an Plentiful Harvests🙏