some toxicities can cause skinny blades. May be a bit more sensitive than the other plants to the nutrient levels given. Can't be for certain based on a photo, but if it has some glossiness to the leaf in real life, back off on nutrients until that goes away and likely improves the blades too (if they are different than others on that plant).
Doesn't look glossy in picture 13/15. Ca def, maybe from dots. real Ca def take a long time before symptoms present themselves from the point of when the problem begins. If you have a good Ca component to your feed, you can eliminate this as a possiblity despite the symptoms.
Could also be a P/K tox which would present as a Ca/Mg def, darker leaves and skinnier blades. your plant is hitting all of those to some extent i think. In soil? back off for a week to ten days, unless you see any fade. Backing off never hurts much, because you can quickly see when it's the wrong thing to do with only a slight fade in short period of time... if it stalls or is slow to react, you know it's a toxicity most likely and to stay the course with water-only irrigations for a while.