Please help new growth yellow and clawing!!

My four Church plants looked to have nute burn about a week ago, with all the new growth(budsites) turning yellow and some minor tip burn. So I reduced the PPM from 1000 to about 600. Now it looks like they need more nitrogen maybe? Please any suggestions would be greatly appreciated. I am using DWC with Fox Farms nutes, PH has been 6.0-6.4 and res temps are at 68-69 degrees. They are on week 5 of flowering(waiting to clone) and I had used FF Open Sesame on my last res change, which is what there schedule called for. I think that is what burned them maybe? Thanks for any help.
 

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