Generative is the lower volume stage, influencing stronger dry back. The plant response is to hurry up and flower vs vegetative that is the higher volume stage.
You run generative the first 21 days of flower to encourage bud set. Push those bitches to set flowers and reduce leaf production. Then, day 21 - to week 7ish, you go vegetative. Make sure they have plenty to drink and no stress. weeks 7-9 or 8-10, you go back to generative. at that same time you run your second round of PK boost. this forces the plants to finish up because they think, fuck, it's getting cold, rains are going away, the bell is tolling. Then, you revert back to vegetative again at much lower input EC and run to the finish line. Really, after week 10, it doesn't matter (in most modern cultivars). They're done drinking anyways so you could just drop to three or four events a day and keep the WC well above 80% with minimal runoff and no complications.