It's going to an N def.
Feed it more!
As far as the minor damage seen on the early growth......No progression and none on the newer/newest growth so forget about that!
(Looks like nute splashing burns)
I would add a Kelp extract to your feeding solution. Age old and Maxicrop are the best. Thrive Alive with the green label (organic) is good too but has an added nutritional value of 1-1-1 so keep those P&K levels in mind with that..