Caapi before mushrooms potentiates the mushrooms 2-3x.
I, personally, would never recommend smoking the vine. I tried once, it felt like Mama Aya was very angry, she wanted to be boiled, not burned (smoking leaves is okay). I had a strong Ayahuasca journey that lasted about three hours, during which she tortured me the entire time. Sucked me right down to the netherworld, had to unplug all the electronics in the room, and it felt like I was squeezed through a serrated wormhole. Never had this experience with smoking leaves or drinking tea from the bark.
Otherwise, I recommend Caapi wholly. Just don't burn her skin. :roll: