1.2 feeds work with the anticipated buildup obtained from little to no run off. When watering 20% plus run off it may come to a point where 1.2 Ec is not strong enough to keep heavy feeders green because you're simply resetting the plants medium to 1.2 when the plants really could use more @ peak stages of bloom. I run plenty runoff, more than needed and when feeding 6/9 @ 1.5 Ec it simply was not enough for my bubbas. As soon as I bumped up Ec the plants greened up and stayed healthy. 2.0 runoff may be a good thing. Paying attention to the actual plant health shows more than just judging feed levels by runoff.