Think u might need to feed every other day, they might be a bit dry after 4/5 under that 400w for 18h a day X 4 = 72 hours!! Thats a long time at 80, 85, not a soil grower my self but your plants look like they need some thing and its not, not having a drink,, try feed 2 or 3 every other day see how they take to it, sure they will pick up, but still it looks like your doing well, try not to worry to much on the first grow, i was the same!! Doing good my freind..

Green boy