I only use 1 bottle of fertilizer per grow, it's NPK with micros 7 - 3 - 6 and I never have nutrient issues, my plants are always green to the end when I chop them, I never let my plant to go yellow let alone have necrotic spots on the leaves, my plants are so happy with my KISS method that why change it?
If you ask me I'm a HPS grower but I'm really thinking on getting one of those LED lights because they are scientifically proven to perform better per Watt than HPS, this improvement is incredible.
I never PH the water of my plants because I grow in typical Moss Sphagnum of excellent quality from a nursery store not the grow shop (they are too expensive for the same or worst result).
In my opinion the plants of your pics look just overwatered, the media where the roots grow is too moist, your plants are having a hard time sweating all that excess of water, that's why they are curling their leaves, just water them less and allow the soil to dry a little bit before the next watering.
Have a great weekend.
