I don't know if its nitrogen or not, the leaves look alot darker in natural light.
My runoff this morning was.
Ec2.0
Ph 6.4
40ltr pots. Watering once per day 2.5ltr each with 20% runoff.
I use phosphoric acid for ph down. Tap water ppm is 0.09
My intake ec was 2.2 and ph was 6.2
The leafs look a bit darker in natural light.
That EC is pretty high imo.
I think to much cal mag for sure, I'd cut that in half atleast especially in late flower.
How's the airflow? You may want to flush a bit to bring it down just by increasing runoff for a few days and feeding lighter. Like 600ppm for a few days with more runoff then up to about 800ppm and you want to be within about 200ppm with the runoff.
I can't say to much about those nutes or ratios because I'm not all that familiar with them so would have to look them up.