For my buckets and pots, I used a 50/40/10 (black cow/MG organic choice potting soil/perlite), half a cup each (if that) of 10/10/10 rose bloom and bonemeal. I will add bonemeal later on if I see the plants losing color and it will make them super dark green within a few days. This year, I decided to follow the advice of a coworker to MG my plants twice a week, after seeing that his tomatoes look like they are on steroids. A few days after the second application of MG, some of my plants started curling up and my tomatoes quit growing completely. I've already tossed the MG in the trash from frustration and will never use it again.
Sounds like they were over nuted from the get go - the MG organic choice potting soil has all you need for the year and more just by itself. I think the Black Kow is a pretty good supplement, especially for garden soil - but not to add to over fertilized potting soil like MG. I'll bet a little Black Kow in some Pro-Mix might work wonders. I might have to try that myself next year. The added perlite helped the MG soil I'm sure, although I don't think Pro-Mix needs any more. Experiment all you want for the rest of the year, but try leaving a few plants alone and see what happens. Water & sun makes peppers happy - they aren't greedy.