I haven't actually added fertilizer, yet.. i bought MG six month fertilizer release soil and i'm almost certain it's the culprit. The plants growth were still very strong but the necrotic spots were getting stronger.

it started spreading to younger leaves so I went to lowes and got a bag of all organic cow manure derived compost and a bag of mushroom compost. I mixed those up and transplanted. I'm hoping that mushroom compost contains plentiful mycorhizzae. Allows for better symbiotic/fungal relations with roots and the soil. Hopefully the plants can deal with transplant shock for a 3rd time...