I also use RDWC for years now and my ec value is always too high at 2,5. Now i'm in week 7/8 flower and my ladies
are almost three times as big as yours and i have ec value of 2. Next week i drop to 1,8 and then flush for a week.
Your npk ratio is according to Awa max 5-4-10, you don't use P/K 13/14. This is required from week 4 flower.
You have to gradually decrease the amount of nitrogen from week 4.
I use Canna aqua and the npk ratio is from base feed 3.4/3.7/9.4.
From week 4 i use pk and the ratio changes to 3.4/10.2/16.4. (25 ml A/B plus 25 ml PK) And add Cal/mag.
In recirculating dwc you also have to add enzymes and the top-feed causes rootrot because the base of the stem remains wet.
Ata zym is a good one. Also from Atami.
Ps I only have two ladies but usually i have around 200 grams dry per lady. With dimmable 600Whps and 2 weeks veg.
Also barney's farm, liberty haze and critical kush.