Looks like something a little CalMag should fix and possibly low K too that adding a little of the Bloom would help with. I bought one of those GO-BOX kits a few years back and didn't like the results at all so it sits mostly unused in the basement.
Here's a much better diagnosis chart than that old one.
I found a great spot to download
FREE POT BOOKS . I downloaded a grow bible first and got lots more. Books looks great and complete like the real ones I have here. No web site but just a page of links. Just right click on what you want and then "Save Link As" to download so they don't open first as some are 50+ megs. They got lots. Enjoy.