I'm still a newb when it comes to planted tanks, but doesn't EI dosing assume that the KNO3 that you're dosing is the sole contributor of nitrate to your system? While that may be the case if you have a very low fish load like a lot of the plant guys do, but the average MFKer's tank has a lot of nitrate generation independent of KNO3 dosing? What's your stock? If your fish are providing a bunch of nitrate (or if you have nitrate in your tap water) maybe you should back of the KNO3 a bit.