I do this with my EVODs and Protank...I have jokingly started calling it 'burping' it. But, like you said its just equalizing the pressure a bit. Funny thing is though if I have my juice bottle handy, instead of 'burping' it, I just fill it up.Pressure is the answer, actually negative pressure. Anyway, if you just have to run it down low, take it off the PV, invert it and open/close the bottom cap to equalize the pressure in the tank.
How simply manage the Kanger Protank gugling and flooding issues.
I've found this blog extremely helpful in dealing with my protank outside of the recoiling/rewicking suggestions.
At the bottom of the page is a video showing the same thing.