To be honest I don't even measure the EC of anything because they seem to grow find for me. I stick to the same nute feedings through veg, then change it for flowering and that's really it. That being said, I'm sure the .7 will be fine and then just see how they take to it. If anything is amiss I would gather you'd see the plant start to react to it (burned or discolored leaves, etc) and ten you can try and tweak your formulas. The changes and problems, if any, should be minor enough so you can just change up your nute mix and not have to flush with water or anything first.