I'd have been happier if we could have slapped the problem down the second it reared its ugly head. :wtf:

Deja, do me a favor when you do harvest....take apart the netpots and check everything inside...is there crud, old roots and fert buildup? Compare it to the roots of the plants that look pretty good when you finally do take everything apart if you could.
If you are REALLY feeling kindly some photos would be heaven.

When you start to flush you might add 2ml/gallon of your 35% H202 (according to the bottle you should add it to the water, let the mixture sit for 20 min, then add nutes, etc...) and really try to help flush some of the old and sludgy stuff along and out of the system.