Alex, being way too hard on yourself bro.. plants look great and they're still stretching for the light.. that means they're not stressed.. I see Tavid said the same thing, it's exactly what I thought when I saw then..
PPM going up means the plants are DRINKING heavily, but leaving the nutes - reduce your nutes, increase CaMg to be a larger portion of your PPM, keep pH 5.8 - let it rock man. They look GREAT.
They look CaMg deficient, CaMg deficient means they will not take up nutes as well, and plants that big, wanting to explode like they do.. they need the Magnesium/Sulphur to launch off.. so they're just taking everything they need from the plant and leaving it in the water.
Remember, you can stop CaMg defs but once the mottling is done, it's done - it's no big deal as long as you stop it.
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That is what B0b pointed me too also.
Rinsed with RO'ed water, and added FloraKleen for a few hours. Now fresh RO'ed water and they are drinking at 800 PPM.
My next grow should be awesome. Thanks to all my supporters!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!