The only things that come to mind is either you're getting too much juice in the chamber (but then it would likely gurgle) or you are taking some pretty hellacious draws and sucking up a little juice. Perhaps a little jiggling of the wick will help dam up any juice that works its way up the sides. Or open up the airflow a little and take longer (less hellacious) draws. This has never been an issue with me so my advice is worth what you paid for it.
Probably the hellacious draws. Sometimes the old habit kicks in without even realizing it, and I start sucking on it like it's a cigarette or a straw in a thick milkshake. I did open the airflow a bit today when i was trying the nano again, thinking that might help it. It didn't, and I was so annoyed I plumb forgot to close it down again, so it's still open-ish. Moreso than before, anyway. I was thinking it might be because of my narrow drip tips; they're the pyrex "piccolo" kind, very slender. When it happens I just replace the driptip, usually with one with a slightly wider bore. I'ver got quite a selection now, and now that it's warm weather, I don't find the metal ones nearly as objectionable as I did in the winter/early spring.
Andria

