After a lot of tutoring by MrSauga I use the
hydrobuddy for calculating my mixes, and I have been following his advice regarding ratios. After all, you can't get much happier looking plants than
this!
MrS sets his ratios as close to 5-1-5 NPK as possible, and his K-Ca-Mg-S ratio at 4-2-1-.5 which is hard to do with only two nutes. And he runs his silica at 50ppm for almost the entire grow after ramping it up pretty quickly.
In terms of using the MC v4 and the GH cal-mag, you will likely be blowing through the limits of Calcium as you increase your dosing, because MC starts with high Ca (in a 2.6:1 ratio) and the GH comes with another 5% Ca and only 1.5% Mg (or 3.3:1). Ideally a 2:1 ratio is better.
Never run Superthrive as it's really just a B vitamin, which doesn't fall on the list of things that cannabis needs.
Have you considered running
GeoFlora? Lots of folks are having success with it. I'm testing it out now and it turns out it works even better if you follow the instructions.