I use GH 3 part. The feed schedule is by the chart. Using only the micro, grow, bloom, and Cali-Magic.
Example. The first column says, 2ml micro, 1ml grow, 1ml bloom. The allowable ppm range is 200-250. With 200 being the minimum dose and 250 being the max. Using RO water only.
The chart doesn't list Cali-Magic until week 2(Second column). Which is 4ml M, 5ml G, 1ml B, 1.5ml Cali-Magic. Acceptable ppm is between 550-700. So when you switch to column 2. Raise the PPM by 100ppm max a day. Until you reach the recommended ppm range of the 550-700.
Continue on, step by step. Using only the basic 3 part and Cali-Magic.
PPM run off should be no more the 200ppm over the PPM of the fert solution. I currently pour 630ppm(column6). Run off measures 680.