Runoff EC has risen the last 5 feedings in a row. I'm at 1200 in, 1650 out last time. And I'm well over 20% run off. I get 4 gallons a day in my runoff bucket, and about 5 or 6 out of the reservoir. The extra water was an attempt to get EC down. Clearly that's not worked, nor dropping the input EC. So...I'll try more, shorter watering. And keep EC down.
I feel lucky so far on this grow. Like everything's gone right - my biggest problem has been plants growing too big. I keep waiting for something to go wrong in the last month.