Happy new year, buddy.
Grow is look really nice ("shocker"), but I do have a question - since you're on a coco slab (if memory serves), you haven't been able to move the plants at all since they've put down roots, correct?
Asking because looking at that pic, it sure looks like the leaf yellowing is concentrated where the the light is hitting them the hardest - that being said, a couple of questions:
1) Do you agree that it's light-bleaching, or do you have another culprit in mind?
2) How far are your hoods from your canopy?
3) At what point in the grow do you lose the ability to rotate/move the plants, and do you think you're gonna stay with the coco mat concept or switch to something that allows for a little more moving?