Possible N deficiency and leaf edges pointing up/canoeing

Fui/wiener,
Since part of the reason for the flush is as a test...just use phed water. And I could be wrong too. So once you have enough runoff to check...do so. If it's real low, that would mean I was wrong. Then just carry on with your alternate plan.
JD

i just checked with a gallon of water and my run-off PPM was 1900+. So i flushed with a couple more gallons and the runoff is now ~400. Looks like you were right JD. Thanks man. Should I give them nutes on the next watering in 5 days?

Fui,
No rush to start feedings yet. Go with water for a few more waterings. Then, like before...start out at 1/4 strength. Like both MrBlu and I suggested. Don't go back to a feed every watering cycle. Alternate feeding with water only. Watch the new growth and hopefully some of the yellow old leaves will green up too.
JD