So, VAPNJ, what you are saying here is that there is definitely no accuracy to the VW circuitry in the Z?
(Not that it matters, because I still believe that there is so much variation in physical characteristics from carto to carto [even of the same type] and variation in personal tastes from hour to hour, that it is still necessary to adjust the PV to optimize to your taste, even if it is a VW.
What I want to see most of all in a VV or VW circuit is a very stable output voltage as the input voltage drops.)
What I'm saying is " "I" can definitely tell a bit of difference from the boosted circuit to the step down circuit working." I didn't change cartos, so that's out, didn't change juice, so that's out, used the same type of batteries in the 2nd try(E'fest 2000maH 18650 and E'fest 800maH 18350's) , so that's out. Right now all I can consider is ""FEEL"" . With the 18650 I had it on 6.0w. With the Stacked I couldn't go above 4.5w. Everyone can take that how you want to take it...or with a grain of salt. As far as 'accuracy'...if you haven't already watched the video I posted in a prior post I would ask that you take a minute to watch it. I think it will explain a lot. Now I will say with both setups , stacked and single when watching the voltage drain underload the numbers on my unit didn't move or drop even .1 volt. That's impressive. The ONLY device I've ever seen never drop voltage underload in 2+ years of vaping is the Fistpak multi-volt devices, and they actually raise in voltage by .5v in 5 seconds of firing the device. So all-in-all I would give the 'Z' a big thumbs up for better controlling the underload voltage drop. I haven't made it to the scope yet to see the details due to some late work related phone calls and a deadline I have but I hope to get there by tomorrow sometime at the latest.