Hum, I was reading some stuff today and they noted the same issue with your plants. Usually they said that Zink, Iron and Manganese are interrelated when it comes to signs of def. In this case it looks like Manganese, although common indoor but more rarer than zink and iron. It looks like that-just like it, but it's hard to note because you are having such pH fluxs.
That should be settled first. Did you pre -soak your Rockwool?
A litle bit more about your system would be good.. Knowing why you are flux wil probable correct these symtoms-since everyhting can now become available. Most plant problems can be corrected with the correct pH adjustment when it comes to mircro nuts.. I think this is what it is.. Some epsom salts will really help and figuring out why your pH is flux will prob sovle the problem.