First Time Grower

This week started off very well but nearly ended badly. I topped them again and removed some bottom growth that wasn't able to get any light anyway. Then later in the week, some slight discoloration appeared on a lower leaf. I realized that it was likely nutrient burn as I hadn't ever seen any runoff after I water. I Ph'd 4 gallons of water and gave 1 gallons to each and went back and did it again as I still had no runoff (7 gallon smart pots take a ton of water apparently). I also raised the lights to 22 inches. That seemed to work. Now that I finally had 20% runoff, the soil was taking way too long to dry out. About 2 days later I fed them 1/4 gallon of nutrient solution even though the soil was still kinda wet. Some leaves at the bottom (really not that many) were developing a different kind of discoloration and one turned a rust color in the middle and and a tear in the leaf. I removed it. I fed them just a few ounces solution each day; not even going through a quarter gallon in that time. They appeared to recover. They went through a lot of stress lately so I'm going to be gentle and only feed them for the next week at least. I tested the runoff and it was slightly a reddish tint (slightly acidic) so I PH'd the new solution around 6.8 in the hopes of balancing out the water on the root level. The girls seem to have recovered and have grown a ton despite the drama this week. These photos were from Wednesday morning which is exactly 5 weeks since tiny green dots first appeared in the soil. Right after the photos, I added more CoCo which makes them look short now. But all in all I think I have it under control now.