I think it depends on the mister you're using. Here's something I found while researching misters.
"Will these misters deliver the same volume of water no matter what water pressure I have?"
The ratings are at 30psi, which is the minimum pressure that we recommend. At 55psi they deliver about 50% more. An example is that the most popular one, the MIST-T10, delivers about 1gph at 30psi; at 40psi=1.2gph; at 50psi=1.4psi; at 60psi=1.6gph; at 80psi=1.9gph; at 100psi=2.1gph. We don't recommend pressures over 60psi with any of them, but the top three can take as much as 100psi. We highly recommend that if you have pressures over 60psi incoming, that you install a
pressure regulator before misters (any brand).
Hope that helps.