Tarzan - pH perfect just refers to two things: (1) the ability of the nutes to find the correct pH of about 5.8 from water that isn't too hard (anything less than EC 0.2 should work), and (2) the ability of nutrients to be taken in at a broad range of pH due to the buffers in the solution which broadens the range of nutrient uptake.
The only nutrients that advanced nutrients makes which aren't considered pH perfect are Jungle Juice, and I believe their organic line (Iguana, etc.). So the base nutes for coco are indeed just Sensi Grow and Bloom (same thing as the regular but with just added Cal-Mag since coco tends to cause these deficiencies). After that AN makes a shit ton of addies which I suspect are largely unnecessary, though people may disagree and I've yet to test it. The ones I'd consider using are:
Big Bud (early bloom booster)
Overdrive (late bloom booster)
Rhino Skin (silica)
B-52 (AN's version of super thrive)
I'd add Voodoo Juice to the list if you're willing to pay an exorbitant amount of money, as root health basically means plant health. Sensizym is enzymes to break down dead root material if you want it.
After that, the big money sucks are Bud Ignitor, bud factor X, Tarantula, and Piranha, which are supposed to increase the number of bud sites and fix calmag deficiencies, add essential oils for resin production, provide beneficial bacteria to the root zone, and provide beneficial fungi, respectively.
