I'm guessing from the looks of the leaves that your somewhere between 4 and 6 weeks? If your that far along, and only using nitrogen, that does also explain some of the deficiencies your showing. You should already be feeding, aside from nitrogen. Although you didn't list your specific brand of soil, miracle grow has several varieties, so if we're looking at a nute issue we'll have to know specifically what soil your using.

@weezard How the heck are you seeing an egg? I see a white spot, but I think its a hole. Maybe some higher res pictures? These are SUPER fuzzy when I zoom in.