I would cool from the bottom and vent at the top. Do u have a good ph/ec meter? I like the blue lab combo meter my self. I would probably look for a better veg nute. Maybe something with a base and then u add beg or flower nutes to it. I'm using botanicare kind with petty good results.
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I don't flush my plants before switching light cycles. I also don't do a dark period. Y r u using bloom food for veg? That maybe where the the deficiency is coming from. U could move the tent closer to the ac unit.
That's what we did. We already had a 20 ton press, so I ordered a 12x6x2" block for like $40 and cut and drilled the block. We ordered our heaters and pid from 710snob. I had a problem with one of the heaters so I haven't actually got it up and running yet. So far it looks like a pretty solid...