Rust Colored Spots? Nute Burn?

I overfed with tigerbloom 2 tbs instead of 2 tsp, been flushing just want to make sure its what I think it is, and not something else. Much apprecated.
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ah rust spots, organics worst enemy. It's definately caused by over-feeding and/or drainage issues. I use organics and every grow I get a few rust spots here and there, I've tried everything but they always show up

Yeah its more than a few, it progressed and killed off a few leaves, I removed what was 50% dead, forgot to take pictures of those though. Thanks for the feedback. I just hope it doesn't get to be to much worse they look so good other than that.