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I'm so sorry ninjagaiden about your problem, I have the same thing going on right now, I am so curious what it is. Its really pissing me off, my room is perfectly sealed, co2, all environmental controls, water is RO, ec never about 1.2, and same pH as you. I did buy a massive microscope from Amazon the other day to view the leaves and determine if something is eating away at them. I have a sneaky idea that it might be the broadmites, Avid and Forbid was ordered at the same time as the microscope just in case its time to go to war!
Yeah doesn't look like you have any perlite in there. Roots need air just like everyone else stated. That's why I weigh my pots with a scale to know when to water so I don't over water and fuck up my roots.