^i do the same, except i do during veg 4-2-1 (grow, micro, bloom), and during bloom is 1-2-4 up until week 2, then i cut out grow and do 0-2-4.
honestly its hard to mix all these nutes, atleast its hard for me, i mix (15) 50 gal res every week. so i figured a way to cheat the dam thing.
call me stupid or lazy, but you know how you are suppose to mix each 3 part seperate? i mix the 3 part formula TOGETHER into a 5gal bucket and i just scoop and pour into my res until desired ppm, then add my bloom stuff, sm 90, ph ect.
yes im aware my buds and overall growth of the plants will be better if i did it the right way, i would be, if i was working on a small room or a few plants. but when working with big yields, and all that hard work alone, the shortcut is actually worth it. and i have had no problems whats so ever.
so in my experience, i shouldnt be recommending this way, but i just wated to point out that i do it, and never had a problem and honestly the difference compared to my lazy way and the right way is nothing dramatic.