@sebi leo
I don't see any real problem with your plants!
The lower leaf death thing is something I would keep an eye on to see if it starts to go up the plant....
Maybe I would move my light about 12 cm closer!
Your pH
should be fine.....but how are you testing it to figure the soil pH?
It is
soil right? Not a coco based media - right? (read the ingr.)
I never got into ppm measuring feeds....I simply followed feed charts from the nutrient maker by the ml, and adjusted them to be correct as the plant reacted to the nutrient....
Hmm, what water do you use? ppm of that?
I'm interested, deal me in.