Yeah, seems the forum has this pretty well diagnosed. The 10 gallon pots are killing you. If you've got to go that small, put them in a 20 gallon grow bag with handles, they'll serve you better. To be honest, I wasn't thinking about nutrient burn, it's June 6th here, my girls have been in the ground for 2 weeks, have seen NOTHING but water, and only when they need it. The more effort you put into mixing your soil, the better start you'll get. Bio-live, Azomite, Epsom salts, kelp meal, along with some organic material, (horseshit aged a few years is awesome and cheap) mixed in to the soil before they go in the ground will save you a grip of heartache. I won't fertilize this outdoor garden until at least the 1st week of July, and then only if they're showing some sort of deficiency. I'll let them tell me what they need. If you're already feeding them in those little pots, you're almost asking for trouble, (nutrient lock) It's been years, but I've locked up huge plants in 200 gallon sacks, talk about heartbreaking, but I learned my lesson, more isn't always better. If it is nutrient lock and over watering, you'd do the plants some good by using the peroxide mix I mentioned earlier, and letting them dry out. it works, dark rotting roots will become white and healthy again in a matter of days. Also, a couple of days after using the peroxide, grab some organic matter, (horseshit or something) and top dress the plant a little because the peroxide as it cleans the roots, also strips nutrients, you'll have to introduce a light dose at that point.