I'm using GH FloraDuo. Instead of the 3 part series it's a two part A/B.
it's a 1:3 ratio easy feeding regimen. 3:1 A/B in veg and 1:3 A/B in Flower.
That works just fine, but I've modified it a bit to work for me.
My magic numbers are 3:2:1
Vegetation 3 parts A - 2 parts B - 1 parts CaliMagic.
Flower 3 parts B - 2 Parts A - 1 parts CaliMagic.
I've found CalMag to be necessary, but my waters starting PPM is between 11-15 so someone using tapwater with a higher background may not need it.