more lettuce..

My tables are in close competition for which one will produce the most smooth leaf lettuce. I don't know if I can eat all of this lettuce!

My main issue this week is the kale and broccoli are still chlorotic on the hydro table. Here are comparative pictures.
Hydro table

Table 1

Hydro

Table 1

I've used vinegar twice now. Should I up the amount of vinegar to water ratio? Are there any other methods to lowering pH?

Also, my Kale is getting huge, but I've seen kale a lot bigger and dark green in stores. Should I wait to harvest?