I'm still not sure this question has been answered. OP said 160ppm is the highest he's ever fed on a regular basis, but is that seedlings or plants?
If you had a plant in full on veg, close to flowering, is 160ppm a full strength dose?
I don't want to assume that it is when a full strength dose is more, and end up killing all of my seedlings because I gave them a full dose of the ferts I use, which aren't measured in ppm as I'm an outdoor gardener (with no irrigation).