The I-30 is a decent topper that blows a big cloud but it has it's quirks. You don't want to fill it all the way up, only about 3/4 of the way or it does indeed have a tendency to flood and gurgle. To clear the gurgle (after emptying a little if needed), remove the clearo from the MVP and hold a tissue up to the threaded end and blow like crazy. The offending juice should spay out the other end and in to the tissue.
Now two more issues with the MVP. One is that it drinks juice like a fiend. But that is why your get such a nice vape from it. Now the other thing is that it is a plastic tank and the citrus flavoring in the pineapple could react with it chemically cause and cause it to crack and leak. I would not personally use a pineapple juice in an I-30
Good point about the citrus I didn't think about that. I had read about the Cinnamon and plastic tank or I would have bought that one, I did fill the tank so I'll try to clear it out the way you said.
Thanks to everyone who offered help and suggestions.