That is most def strong. I started my grow using GH. I never went that strong. One good way to tell is to check the ppm before you feed and then check it an hour later and if it goes up you are feeding to much. You are actually using the same nutrients I used the first 4 or 5 weeks of flowering then I changed to botanicare bloom soil/hydro. (no reason other than I had a bottle laying around and wanted to finish my grow with something slightly more on the organic side). Check before you feed and then a bit after and post up what happens. It is for sure to strong. My water starts at 40ppm and I still always put almost half of what you do. (I also use Karma)