I used to smoke ~1/2 pack Marlboro reds a day. I've been vaping exclusively for 2 months now, pretty much a clean cut-over. I do ~2ml of 18mg a day, no sessions, puffing (and inhaling) as I feel like.
I don't know if mixing ecigs and analogs is a factor. I tried smoking analogs a couple of times just to see. I absolutely hated the taste and the smell from the first instant.
I've experienced mild withdrawal symptoms a few times -- agitation, impatience. But they either didn't last long or were not strong enough for me to tell the exact end.
I'm not sure what you meant by "hits" or "wired". If you just take 3-4 puffs of ecigs, that's hardly anything according to my experience. If I over-smoked analogs in the old days, I'd feel a bit sick in my stomach, that's all.
Personally I wouldn't worry about the claimed equivalency, or even nicotine concentration that much. Trust your body and follow it.
Hope this helps a little.