Very little vapor with glass mini bubbler attachment

I’ve had my Mighty for a week, and I’m liking it so far. I had been using a glass bowl for the better part of the last decade, and finally made the switch to vaping. I got a mini bubbler attachment today, filled it up, was very excited, and..... I got maybe one good hit out of it. I’d get some vapor out of the other hits, but nothing consistent with the draw. Used it on 2 other capsules to double check... same thing. I put my cooling unit with glass mouthpiece back on, and it hit like a champ. I was hoping to be able to get a few (3-4) good hits out if it. Is this user error? Did I get a faulty one? Has anyone else had any success/issues with this attachment? Any other recommendations for attachments?