Hi ako0396 -- welcome to ATP !
How exactly did you fertilize with MG? sprayed the plants? drenched the root zone? The spots on the leaves could be a combination of the fertilizer and sunburn on the leaves -- I don't think it's really anything to panic over... maybe just a lesson to learn from
From your post, I think you may be over-reacting a bit to every bug and spot that you see... nature has a way of correcting itself, although sometimes we do need to step in for major issues. A few holes in the leaves won't hurt the final result -- you might want to just try using a brisk spraying of water to remove some bugs. I'm not an "organic gardener," although I aspire to be... but my motto is to use the least poisonous tactic first and proceed from there.
