I noticed Aspire changed the Nautilus Mini without mentioning it. They have changed the base design, adding a new element and reducing airflow. I set someone else up with the kit I have (mini and mvp20w) and noticed the design change when I unscrewed the coil. I'm trying this "new" mini for a while to see if there is any noticeable difference, aside from greatly reduced airflow. As for gurgling, at least with the original mini, that has never been an issue for me, which is why I have been such a fan of the nautilus mini.
I think the key is to make sure you have cleaned out the center piece when adding liquid. When you unscrew the base and coil, use a tiny rolled up piece of paper towel or napkin, and push it through the top and bottom to make sure all the juice is out, and then use that same piece to run through the drip tip to remove any juice there. I also use another little piece to wipe off excess juice on the outside of the coil (never stick anything into the top of the coil). You do that each time you refill, takes about 10 seconds. You can also just use a q-tip. The other thing you need to do is rinse the base out once or twice a week, as juice can build up there, and create a strange taste.
Now that Aspire has changed the base, I'm curious to see what happens. Perhaps the base will need to be cleaned less than once a week? We'll see. Right now I am just saddened that the airflow is so much worse than the original mini, and that Aspire changed the designed without notification--there is no way to know which version of the mini you'll get. I was delighted when they released the cotton coils, but they marketed them as such. There was no change in marketing or packaging for this mini "update".