Hey there Fog,
I finally stopped by for a visit!
I love the overall setup. It is simple and cleanly done.
Plant health is on ht good end of what can be expected with your 2 main problems, which are limited light and not enough root space... those rockwool blocks, if I were you, would be peeled of their wrappers and sunk into a bed of hydroton,l in a tray with drainage of course. The plants look healthy overall but the slight droopiness can be a sign of being seriously rootbound.