Leaving the regulator pressurized is very static.
After service or just as a occasional in depth check, I actually tend to leave a regulator pressurized (with the tank valve closed) for a few days to as much as a week and I check every day if (or how much) has pressure dropped. Small pressure drop (overnight) indicates very small leaks and they can be very hard to find and are really not an issue, so I may ignore a very small leak.
The static contact on the first stage seat does help, but it doesn’t set the seat as well as the dynamic action of opening and closing.
I have seen regulators (one very recently) that had a very small first stage creep until I did some quick repeated opening and closing of the seat, very quick short blast by tapping the second stage lever.The dynamic action basically did some very minute seat slamming into the volcano orifice. The IP in that regulator has locked solid since I did that. And it responds and work perfect.
I don’t own a quick set machine and I cannot justify spending that kind of money for one of them, but I would like to have one.
I actually would like to make one with a slightly larger volume draw to create a consistent and repeatable sinusoidal volume draw, for testing purpose. But I would settle for the quick draw machine for starters.
Since I don’t have a quick draw machine, I perform a very dynamic quick set by hand, just manually doing a bunch of second stage lever taps or purge button taps. Then I leave pressurized over night and I do the manual quick set again the next day. I may repeated that for a few days.
If I did a bunch of regulators (like Bryan), I would have bought a quick set machine a while back.
