Trapper, its all about getting educated on Advanced's hydro nutrients. For example, Coinossaur is specifically for flowering in hydro. Their basic Micro Grow Bloom is as well. Good luck! I'm about to put 6 AI's in hydro myself. I was traditionally an organy soil grower, so it'll be a fun...
Nothing you buy from Advanced is a waste, especially Big Bud. Its all about knowing when to use what. Overdriving is in the final flowering phase. Every Advanced product is awesome.