Read through all he comments here...Again. Looked at those photos again ... and I think two things:
Flush all system water and start over with your source water. get to the recommend ec value for the fertilizer you are using by mixing a and b in proper proportions a little at a time until ec is achieved. Add a little cal mag. Ph adjust. DONE. wait and see results. I would steer clear of adding anything else, although maybe it would work for you, it just makes sense to dial in the basic recipe and then fine tune. KISS KEEP IT SIMPLE STUPID.
And no, your lights are not too close, you don’t have light stress.