Quick question about these medic abilities (Adrenaline Boost, Transfer Supplies, Metabolism, and Speed Boost). Are they just secondary effects when you buff a teammate's health, or are they completely separate buffs altogether? (Ex: When you have Metabolism equipped and boost a teammate's health, does person's regen rate also increase after that boost?)

As far as I know they are separate buffs. It would be unfair if you could buff speed, metabolism, health, and whatever other ability using only one pip

I'm guessing you have to equip each buff separately (between matches or at a CP, I'm not sure) on your ability wheel and use them separately. A super buff like that, while enjoyable, is too much.