Well I meant 1.65 was the feed EC with is around 800 ppm. But that is also the recommended "light feed" amount from GH. But others here, as well as cocoforcannabis (my primary source) say 1.2 EC is more typical.
Flushing, lowering EC to 1.2 and lowering calmag to 2.5ml/gal is my game plan