A charged battery makes a world of difference. I have a hypertank, same idea as the pro tank configuration. It will leak and have gurgle from time to time. Key is clean with a q-tip in and around the juice wells of your pro tank. After that, it vapes like new.
The provari mini is a great mod. Note that I have one of my own. 510 connections work well. I personally use carto tanks as everyday and drip tips from dual coils and single coils as a hobby. The provari mini is expensive but has never failed.