It is ok to mix 20% to 30% coco into soil to lighten it but this makes it hard to feed properly because of the special needs for calcium in coco. You would be better of using a soil designed for cannabis. Coco and organic do not work. Stay away from Fox Farm Soils.
Yes, the Fox Farm Trio will work with Bio-bizz. The biggest problem in starting with a precharged soil is the timing of when to start feeding and the strength. The knowledge for this comes from experience.
@autobeast Has a formula for using Light mix with some Advanced Nutrients that works well and is fairly simple to duplicate. I would recomend you do that instead of the FF Trio but I may be cost prohibitive as the AN is pricey. It will lead to a harvest though!