lol your plants are supposed to rise with lights on and droop slightly when off this is natural, I use dwc with ghe trio micro/flora/bloom tap water and ph down nothing more nothing less , first your rockwool/coco doesn't need to be wet the roots will draw enough, second when using the ghe trio add micro first(something about causing blockout) then flora then bloom, you can follow the chart that gh provide even at full strength your ppm will be lower than you can go to ,Remember its a guide not gospel,leave about 1" to 2 " of roots out of the water and don't be topping up every five mins you can leave for couple of days then just check ph, and refill. its recommended to clean res once a week but a few days ....
and here is recommended ppms but JUST A GUIDE.....These numbers are based on EC readings, .500 readings, TDS readings converted from EC or the common Hannah Chart:
Seedlings, Early Sprouts 100 to 250 / ec 0.2 to 0.5
Early Vegging 300 to 400 / ec 0.6 to 0.8
Full Vegetation 450 to 700 / ec 0.9 to 1.4
Early Blooming 750 to 950 / ec 1.5 to 1.9
Full Mature Blooms 1000 to 1600 / ec 2.0 to 3.2