My gut is telling me you went the other way in your feed - that you didn't give them enough... BUT - I AM seeing a bit of a problem with calcium which COULD be caused by overfeeding the grow nutes (excess nitrogen can cause a lockout)... This is tough to say since it's a question of "I might have..." - so what I'd suggest is to add some calmag to your next feed and see if this doesn't stop the problem (and btw, calmag should only be added once a week if you want to continue with it) - the yellow leaves are not going to get greener or improve in any way so don't expect that but further yellowing shouldn't happen a LOT... you might see a LITTLE residual effect. If this DOESN'T solve the problem, then go ahead and flush them out adding in 1/2 strength nutes at the very end of the flush. Your pH is spot on so that's not causing the calcium problems...
Good luck!