HELP PLEASE How much Nutes for DWC

ok so here i am at a crossroads.

Before my plants were drooping a bit and i noticed that i probably jumped the gun and over nuted the plants to early in their life cycle.

So another week and a half goes by and all is well.

I get home from work and the plants have since drooped.

They look good in colour so i increased the amount of Nutes and did a res change. i flushed them in water first.

They still seem to be drooping and i am worried now because i am reading that you should never go more than 600-800 ppm during veg in DWC?

HELP please.

OK so an update... It got a lot worse and a lot of the larger Fan leaves actually started to go yellow and have brown dead spots all over them.

So where they are at now is sitting in individual pails with their own airstone. They are soaking in distilled water ph balanced, waiting for them to perk up. The leaves that were dead or 50% dead i have since trimmed off.
Im not sure if it was a right move, but they were dead or dying and blocking some light on some new growth that is still in good condition.

If someone could throw out a reply and let me know if it was a right move or not to cut the branches or not that would be great. I am already starting to second guess my move.

Cheers.

start off with 1/4 strenght like after the round sets of leaves fall off or 3 weeks