if it didn't cause a toxicity, it was fine...
same strain doesn't mean exactly the same. if not from same batch of seed, even more so.
either the plant can use it as fast as you provide or it cannot. anything up to 'cannot' is good. over time can deduce this. may vary with different temps/rh/ambient co2 etc. mulder's chart is something you can reference to see various relationships between nutrients used by plant.
Hard to say if your canopy is 'too lush'. see initial start to some interveinal damage, which could be related. if it stays isolated, it's probably fine. all about how things progress overtime as opposed to any snapshot in time (picture).