I was getting gurgling with my first build also. But AD is correct, my cotton was too tight in the coil and I pulled the cotton away just a taste from the wall and have not had any gurgling at all. I have not tried the factory OCC yet, but if they behave as well as the build, this Subtank Mini rocks even more than I thought.
I have not experienced any leaking at all Penguiness.
The OCC heads are legit.

