interestingfellow, I also make unthinned (save for the flavor) VG juices for dripping. Love it. Too thick for cartos though, at least to me, and alcohol dries me out. Most of my juices are 10% flavor and 10% distilled water, plus nic and VG. If I use less flavor (if its a PG flavor) I use more water, so that %flavor + %water = ~20%. That seems to be a good rule of thumb to allow for good carto wicking.
Water will open the nic up, meaning the droplets in the vapor are smaller so the nic more available, and you actually perceive the nic more, such as in TH, nose tickle, etc. That's been my experience anyway. Opens the flavor up more too. YMMV.