Miracle Grow does NOT contain any micro nutrients. Just straight N-P-K.
Plus the pH of Miracle grow is way off unless you correct it i think thats why alot of people complain about plant burns, if u mix up a batch of decent nutes and test the pH most will be right around 6.5 - 7.5 (which is somewhat neutral) if u mix up a batch of MG nutes the pH is no where near 7