Keep a bit of VG to make sure your mouth/throat/lungs don't get irritated if you have medium or high nicotine. I use juices with 10-20% VG. 90PG/10VG would let through the most nicotine TH while still having a bit of VG. Only 100% PG would let through more. Note - nicotine IS throat hit. The less nicotine, the less throat hit. Zero nicotine = zero throat hit (other than any throat sensation the flavoring provides). All PG does is let flavor and nicotine's TH (and irritation) through better. VG buffers/dulls/smooths all of that but adds thicker visible vapor. Note - I avoid juices that drop a lot of flavoring sediment in the stuffing (clogs cartos, shortening their good performance and degrading the drag and wicking)
I don't really understand the benefit of dual coils. With the 1.5 ohm ones you are sucking a ton of power (enough to damage some batteries), but you are basically vaping 2 low-heat 3-ohm coils at once? Seems to me that would be more vapor, not necessarily more hit than (for example) a Boge 2 ohm carto. Heat (lower coil ohms) enhances hit but a 1.5ohm dual coil just probably a double dose of vapor of standard resistance coil warmth? But I have not used them. If you have big 510-threaded batteries try Boge 2 ohm cartos too (3ohm or 2.5ohm if you have a slim 510 battery). Dual coils are one of the better new vaping technologies of the last year but Boge are still more popular for 510-threaded devices.
