Yes, all those AN supplements (or alternative equivalent products) are essentially needed. For beneficial microbes, you might look at more cost-effective options, such as HydroGuard or ReCharge. And you might consider replacing Big Bud with OverDrive (which I and some others use throughout bloom), although you surely can use both as the schedule recommends.
Perhaps for base bloom nutes consider using AN's new pH Perfect Connoisseur Coco Bloom A&B. Connoisseur Coco is their new top-of-the-line base nutes, designed specifically for coco; it's above the Sensi line; and it doesn't cost that much more.
I am now in my 3nd grow using a Connoisseur Coco Bloom-only regimen from sprouting to harvest, never using Grow base nutes, following a modified TaNg's simple schedule. I have not seen any deficiencies or excesses, and transition from veg. to bloom goes smoother vs. switching from grow to bloom nutes.