Hi Guys,
First post here! I also got a Hippo v2 and mounted it on my Provari. Boy was I disappointed at first! I use just regular boge 510 cartos and a Phiniac tank. Was running into the same problem where the thing wouldn't fire at all.
I didn't know what everyone was talking about with trying to screw the pin to adjust it. I don't think it's meant to be screwed, as mine is just a simple push or pull adjustment. What I think might need to be done here is pulling the connector a little further out of your carto. If you've watched some of Busardo's videos, he's done that to get a better connection on deep sockets. So I took my mini screwdriver and wiggled the connection a little further out so it's not sitting flush on the carto any longer. It sticks out just ever so slightly.
BUT slapped the thing on and fired it up and works well. Problem solved. Now some might say "well, we shouldn't have to do that", but for me it's a small fix that took 10 seconds, and works relatively well.
Thx!