I own 2nd Gen version NC-II/25. Potentiometer wheel numerics are reversed from 1st Gen version (per OP comments).
1st Gen Version
0 - 100 numerics = 2v - 6v output. Adjusts potentiometer output.
Higher number = Hotter vape.
VS
2nd Gen Version
0 - 100 numerics = 6v - 2v.
Adjusts potentiometer output reduction % (lower number = lower output reduction, higher number = higher output reduction).
Higher number = Cooler vape.
I used a 1st Gen before buying a 2nd Gen and have seen how this feature control changed/reversed (as OP has referenced). Some may not be aware, or may not understand how a potentiometer works, and/or how a potentiometer reading in percentage works. A potentioneter is a manually adjustable variable resistor, where higher resistance = lower output.
I find that occasionally, when switching from unregulated parallel to regulated series, that the NC-II will fire at full output upon first firing unless potentioneter is adjusted after changeover (both on 1st & 2nd Gen versions).
ALSO, The coil(s) installed will have effect on whether parallel unregulated or series regulated (at minimal ouput)will be hotter.
Example: when I run coil at 0.2ohm parrallel unregulated and switch to series regulated at 100 (max resistance value on end Gen aka lowest output), the vape is hotter (same result described by OP, but opposite potentiometer wheel rotation & numerics). I can run in parallel unregulated until vape becomes weak from low power, then switch to series regulated to increase vape temp until can get fresh batt's.
I find that somewhere between 0.2 - 0.17ohm that series regulated does not work (coil(s) resistance too low).
To reduce minimum output, on series regulated, increase amount of wire mass of coil(s) and resistances of coil(s). In my example above, I would increase to a 0.25 - 0.35ohm build.
Hopefully something helpfully here.
Regards