I usually take it pretty easy on my nutes(fox farm) and by the end of flowering they are starving for food. Im thinking the pre fertalized soil might actually be a little to my benefit.

I use clones that I start in jiffy cubes so I just transplanted a few rooted clones today with the mg soil and Im waiting for a few others to root also. I think that the soil will be just fine for now, ill just go back to my ff next time.