CBD Blue Shark mainline

Growing well. Just fed 12 cups Ph'd water (6.3). Lots of cold humid air coming in from outside, plus with the half soil half coco mix I think they're holding water a long time. They're only needing water once a week right now. They were not impressed with the water-only feeding. Some leaves got burnt tips, some got small yellow dots that look like spores or insects but I don't think are either. I think it's some kind of nutrient or pH unhappiness. I only gave 2/3 of the amount of water I normally would, hoping that they will dry out soon and I can give a proper feeding and check runoff pH. I left them alone for a couple days and boosted the 1000w back up to 100% to dry things out a bit more. The buds loved it but I think it's damaging the leaves a bit. I put it back down to 75% just now. I forgot to adjust the intake fan from outside down to low overnight from medium during the day and leaf temp was down to 13.3c when I woke up. Can't be doing that either.