I went back over all my notes to see if there was any thing that jumped at me and found a problem. When I transplanted into my 3 gallon soil, I top dressed with plant food the following week.. I don’t know why I did this or how the timing got messed up but that means that 7 days after transplanting I was throwing ferts in the dirt when it says to wait til week 4 to fertilize. I imagine that’s where this burn came from. The soil was still providing nutrients when I threw even more on top of it. That explains how it’s lasted so long as well.
Edit: thinking more about it.. I must’ve estimated that at 3 gallons (more like 2 since my rootball was 1 gallon) my soil was going to need to be fertilized at 14 days instead of 30.. I then took the knowledge that dry organic ferts take a little bit to breakdown, and smashed it with my poor math skills and thought “I should fertilize a week before so it’s breaking down by the time I need it”
I like identifying the thought patterns that lead to my mistakes so I can attempt to fix those as well