I do the standard 3/4 wrap as well. Will be trying others eventually, but I've only had to wrap three coils so far, and the second one was just to move the wick to the other side in order to line up the intake better.
I've found a slow, steady draw speed to work best, but the length of time varies from three to about 10 seconds--mood and all. Also, I smoked hand-rolled, unfiltered cigs, so my draw speed was slow and long on those as well...
I obtained my v2 third-hand, so while I have personally done no modification to it I received it with a 1.2mm intake and 6.5mm mouthpiece. I don't know that I "need" the mouth-bore that large, but it's definitely distinctive and I know I'd be able to pick mine off a table full of them
