It,s very diffucult to say what the yellowing is from but you can be sure it,s result of your over ferting.
I never herd of that fert but you done the right thing by flushing em.
You,ve let them get miles too big for you grow space , so i would give em a trim bearing in mind you will have a plant 3 times the size coming out of your grow room as when it went in two months previously.
But my mate has grown blueberry and said it was a real lovely smoke and high that gave you couch lock all night.

I grew Durban poisen about a year back and found it a miled perfumy smoke with a chatty nhigh.
Nice 1.

So hope they pull through 4 u coz they r worth it.