Subs SS-6wk Flower Prob!

Hi everyone. Got a prob. Sorry, no pics. But I'm sure you all have seen this. So 4 different strains. All in 7gal pots with SS. Same everything. Including some teas. Temps 79f day. 70ish nights. 600whps. Top dressed at week 3 of flower. 1 month veg in SS before 12/12. 3 plants 50-75% fan leaves yellowing. But the 4th a blueberry gum is damn near full yellow. And it looks like the lil in-between and sugar leaves are starting to yellow! I have given her some pretty strong teas high in P and K while upping N a lil bit. So just teas and water for 3.5 months. Any suggestions would be greatly appreciated.
 
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