Did you ever get a chance to check the pH of your run off? a lot of issues that seem like def. are actually just due to lockout from the pH being off... One thing that might make you feel a little more at ease is that mature growth will not heal itself. so if your older leaves start to look bad and you correct whatever issue you have they may still look shitty, but as long as the new growth is healthy then you should be good... but i still think that a little pH adjustment and you will be good... if you havnt already. It would be a good idea to check it now anyways since you added the epsom... it will throw pH out of wack like crazy.