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I've had to add a pinch of epsoms to h&g cocos and aqua flakes in the past fixing a slight mg def. Nice room, I'll be lurking
Some strategically placed Gavita DE systems might be the answer to that problem. They are intended to be used horizontally, but from higher up, and designed to utilize the overlap and cross lighting that space is going for. You gotta do what you gotta do, and it sounds like you might need to pull the lamps up a little bit.
Doubling your lights would mean doubling the heat too. At 4,000 btu per 1000w light you're already maxed out. It might be an investment for another day, but a mini-split and another 6 set, probably another 50amp 240v and 30amp 240v run for the power needs... but add in some CO2 and that place would be kicking.
Also Ide consider dropping drip clean.. Ive always heard mixed reviews and Ive never personally been a fan...
I don't know if you got your problem fix but i had same problem as you with droopy ladies.
How bad is your tap water?
I believe your biggest problem is the co2. Turn it off for a day and see what it does for you.
worst case scenario it won't harm you.
I have a room the most i can inject co2 is 600. Anything over i get all types weird leaf problem.
I see a nitrogen deffiency on some and sometimes overwatering can look like a ph problem..jus sayin.