Nute line ppm numbers in pro mix

I’m growing in pro mix hp and hpcc plants are in 7 gallon fabric pots with the roi680 led wich I love. I’m using the dry earth juice line the recommended dose of nutes are only putting me at about 300 ppm sometimes I’ll give them 500 ppm once in a while but everything I’m reading is saying I need much more nutes but plants are looking good I’m feeding every time with vert little to no run off anyone experienced.and here’s a pic 20 days in just because

It will take a while for a 7 gallon pot filled with PM/HP to get depleted of nutes, but even when that happens, I have never had to use more than a 700ppm mix to keep my plants happy in late flower using PM/HP cut with 40% perlite, and 180ppm of that are my ca and mg supplements!.

Ok that was another question I actually had I’ve been hearing mixed reviews of people using cal mag mixed in with the nutes. do you use the cal mag every water and do you feed every watering as well