Holy shit 3000PPM! that may be a new record.
Anyways, just to reinforce what some others have said (and correct some of the poor advice) Your night time temps are just fine. Your humidity can go up to 70% during veg with no problems. When you start running hot and CO2, it can be stressful on the plants as their is such a high vapor pressure differential. AS soon as you start developing some flowers that are pretty thick/dense, you want to get your humidity down to 40%. 50% is ok, but 40% is even better. drier conditions stave off mold and also help resin production.
Have fun and quite feeding your girls the equivalent of battery acid
It really is true that less is more in the nute realm. Just because their is more available, doesn't mean that they will take more. Its actually the opposite.
Cheers.