Just to throw in here...and this is my journeymen electrician ticket taking here...there's 3 different types of physics at play here...fluid dynamics, thermal dynamics and basic electromagnetism (broad term for electron flow)...I know diddly about the first 2 but I do know electron flow. Now I'm not supporting any one position here but the fact is we want watts, watts = heat, I think that's a common desire with all of us right?...so with a given resistance, say 2 ohms (for simple math, also, lets ignore v drop, hot/cold r changes, etc...)...4v applied to 2 ohms will produce a 2 amp current, 2A x 4V = 8W...that same 8W can be achieved with 5v applied to a 3 ohm coil...but you current has dropped to 1.7A...in the electrical world, you never want to lower your load resistance to achieve higher wattage, high current is hard on equipment, more expensive because conductors have to be bigger, require more robust switching, etc, etc...this is one of the reasons why the high tension wires overhead run at upwards of 500,000V, now super high V also has it's issues but that's another story...where this starts to blur into the other 2 physics is, a 3 ohm coil will cover more wick area than a 2 ohm coil (provided the same size Kanthal is used)...that same 8W has to heat a larger area of wick, so even though 8W is 8W...thermal dynamics kicks in and you will need to overcome that...that larger area may need 9.12W (outta my a_s) so you need to adjust your V up to 5.2V or so, which is fine, again, it's always better to adjust your potential (V) up than decrease the resistance of your load (which raises current, A).
...I would like to hypothesis here..., again my Fluid Dynamics and Thermal Dynamics are a little rusty but can we safely assume that "all" of our exposed wick contains juice?, I think so...wouldn't we want to spread our heat over the largest part of that reserve as possible in the spirit of efficiency?, again, I would think so
...I started out saying I'm not really supporting any one position here but now that I think of it, I guess I am...BJ's on the right track here, even though I don't necessarily follow the above (because I also like the simplicity of a single batt/mech mod), I think the best way to dial in your particular vaping experience is adjusting potential, not the load. This can be argued ad nauseum but at the end of the day ohm's law is what it is and high V is always, "always" better than high A....and an incremental increase/decrease of V is a much more finite adjustment...current is the kettle drums, V is the string section
