i dont see why the wire wool would go dry if these two were not touching the coil plus wire wool heat is hotter enough to cause the nicotine to drip from the cart core on to the wool,thats how i see it, if its pushing up tight it burns!if you push the core a bit higher in to the cart it still works so proves my theory.this is what i do when the fibres get burned and tangled and it still feeds the wick and wool.
so Kit your line of thinking is : the heat generated by the atomizer from the vapourizing process heats the liquid in the cartridge . This heat is sufficient enough to lower the viscosity of the liquid which allows it to drip onto to wire wool bridge.
Kit, without sounding rude that would mean the heat generated would have to be pretty darn consistant. which we know just by touch that it isn't.
If it's not hot enough it won't thin the liquid which then means it wont come out of the cart.
so if after a little use the heat (as we know ) get's higher. So if it gets hotter therefore the liquid gets thinner and so pisses out the cart and flooding it.
That method of operation requires alot more control than these devices can give to allow these things to work as well as they do.
thats the reason you shouldn't leave an ecig battery end down for any length of time , because the wire bridge and gravity would convect the liquid from the cart and flood the atomizer and battery.
I bet that you could hang a new cartridge up by the mouthpiece and leave it all night and not a drop would come out, but if you done the same but put a cocktail stick up into the cart filling and left it all night then the cart would be empty because the cocktail stick will act like a wick and allow the liquid to run down it.
i feel an experiment coming on....