Yeah I am interested, that's what I am here for, well...not really but kinda. Anyway...
I can't believe it has been taking that much water, damn.
I see you're using the AN Micro, Grow and Bloom nutes. Great stuff. Are you still on the Grow nutes now?
I wouldn't jump to 600 ppm just yet, not from 295 ppm. I would go more like 450-500, but I could be off on that. I just know it's good to increase your ppm slowly and see how the plants respond to it.
I think you picked up on this, but again I recommend having a dry cycle by not watering every day. Let them dry out good in between. Yes, use the weight to tell as you have said, good.