Hey there, so anytime i see someone with a nice easy dose of a well rounded nutrient schedule like yours having these various problems, I dont think there's a lack of nutrients, they're there, but unavailable or inaccessible. If it were me I'd possibly flush your medium but amp up your ph slightly into the 6 range. Also just a few thoughts, hows your copper intake? How far away are your lights? Do you see any pests present like fungus gnats which can cause this bleached white colored look. Or are fungus gnats not typically a problem when doing hydro?
I hope we could all offer some suggestions to prod you in the right direction. Good luck and happy growing.✌️