I would be careful with the nutes.

Mr Blue is correct in advising to move to bigger pots - you really shouldn't worry about fertilizing your plants just yet. If you repot and give them another couple of gallons of soil, they will be OK till they START flowering.. then you can think about fert.

Apart from that, your photos don't show any light burn, although i'm no expert on fert burn, i would suspect something like that. StinkyAttic would know.

Keep updating.

MJD