So I think this is the week where I started to go a bit wrong. The Dr Earth I added on week 4 fixed my nutrient problem, however, I was impatient and added a bit more. As a result, I had 2-3 crispy, yellow leaves on the Quarter Pounder in the middle. Since then, I've upped my watering a bit and it seems to be fine.
This week
* Lights still at 15"
* Giving about a gallon of water every other day, each. At this stage, I get barely any runoff, but stop when runoff is consistent.
* Top dressed w/ more FFOF with some myco mixed in.
See video for a better view of the nute burn.