So my wife understood how much I wanted to “play with my new toy” so we got rid of our company so I could.
I played around with water level in front of a mirror and then decided to start higher up than I originally had planned. I too started around the midpoint between the O’s (a la sasNW), but I fear my lungs are too aged to get a reasonable draw and recycle with my EVO at that point. Lots of vapor, but not much water draw to recycler, etc. So I bumped up my water level to just below the bottom of the “R” and that seemed to work better, but I still couldn’t really see if I was generating any kind of vortex or not. Water flow was there I figured. So I added a few drops of Cranberry Extract (cheap RezBlock substitute...see RezBloc thread) and with the coloring and bubbling in the water the vortex is really clearly visible. Plus, as I prefer my vapor on the lighter side until bedtime the distinction between the vapor and the water is clearer and you can see the vapor vortex too.
All in all, fun and effective!
~