Gotta love AVE!
For me, I use bottom feeders, or drip with their juice. I've had some success with the metal CE2 cartos (syringe fill), but I rarely use them. I've tried other cartos with filler, and I can't get it to absorb. YMMV
Reference: Boba's, Gorilla Juice, Hype, and Caramel Kicker.