Do you really need a different balloon vape? Better and faster??----I'm not sure there is such a thing if you count from turning the vape on. Herbie on and ten seconds later you are blowing balloons.
Volcano is an option and it does blow balloons faster ONCE WARMED UP. From a room temp start, the Herbie is mighty quick to fill a balloon/ hard to beat.
And I really like that Herbie is not a one trick pony (Volcano = balloons) as Herbie is great with a whip, a long glass mouthpiece, a hydratube, or a bubbler----all around champ machine.
Have you tried using beyond its balloon function?
If you want to add something, I'd let the Herbie continue to be your "bagger" and pick up a miniVAP as it offers supreme taste and efficiency AND it's a desktop AND a portable (with longest battery life of any portable and an AC desktop with optional AC puck).