I did think the PPM was a little low as well. But I believe that is for hydro? So might be different with the soil component.
I read through a thread that @latewood posted. It is basically a spin off of the Lucas method. It was for use in hydro but I imagine the similar effect should work in soil. He runs a 1-1-1 mix for veg and then starts cutting back on grow and micro and upping the bloom so you finish at 0-1-2.