Just remember, not everything happens overnight. And not all leaves recover. The only deficiency that I have seen "fixed" leaves is nitrogen as it is a highly mobile nutrient. And NOT necrotic N deficient leaves....those are lost too......I mean a leaf starts to yellow ONLY because of N deficiency, and it hasn't curled/shrivelled up, it can sometimes regain it's green for a while.
Most other deficiencies leave irreparable damage. Fixing the deficiency may stop the progression of necrosis, or chlorosis, or strange growth......but usually, unless its nitrogen deficient, you generally don't see leaves "rebuild" or fix. Most, I look at new growth for indicators.
Your soil pH may be a little high as well, which can lock out certain nutes, like Phosphorous. With soil, I like to run my solution at 6.5. Seems to work best around that range. In my experience.
Rockwool I would run around 6.0-6.1 pH'd water/food.
I keep my current coco grow at about 6.2-6.3 pH'd solution. (still working on figuring out the coco though, as this is my first grow with it) I never actually pH test my medium. I just found those ranges worked great for me, with the water I've had access to, and the nutes I was using. Tap water, and General Hydroponics feed.
