It sounds to me like you may be severely underwatering, I had to water mine every 4th day in veg and now every 3rd day in flower and it may even soon be every 2nd day after they get even bigger.
Also I don't see much in the way of perlite in your soil, and those brown spots do look like mag deficiency from what I've read.
It's definitely not that bad and doesn't seem like it won't come back (meaning it will come back
).
You may want to give it straight tap water for a few days (for mag content) that or RO+CalMag or some kind of mag supplement (I've heard epsom salts work well); other than the food in the soil, don't give it any nutes, let it heal itself first, the soil should have plenty for it. Less is always more.
EDIT: Now that I'm looking again, your top leaves (newest growth) seems to be okay, maybe just continue w/ whatever it is you are doing and it should be okay for all new growth; what is already damaged will not 'heal' in the sense it will change the way it looks, just focus on having new growth be nice green and lush.
Also I wouldn't move them any more than is necessary, plants are used to being rooted in the ground after all and not used to being transported from one spot to another; let it get used to it's environment and don't disturb it any more than can be avoided. Especially when you don't know what could be in the air waiting to latch on.