Question for Aquamist and water pressure selection

[mx5]

I am looking at the flow numbers listed for the jets at the Aquamist site:

http://www.aquamist.co.uk/sl/plist/pic2/jets/jets.html

Let's pick up the 0.5 mm jet. The link above says it flows:


150 cc/min at 72.5 psi (5 bar) ( with the standard pump )
200 cc/min at 101 psi (7 bar) ( with the race pump )

I have the Aquamist 2D kit. I haven't attached a water pressure gauge, but the water pressure sensor had writing on the sticker that it is preset to 75 psi. Why is that?
The higher the pressure the better the water will be atomized, right? The Aquamist 2D includes the race pump. Then why is the kit set from Aquamist to keep the pressure at 75 psi since everywhere else at the site the quoted flows with the race pump are at 100psi?

Should I get a water pressure gauge and readjust the sensor to 100psi? Or to some other value? Or was it set at 75 psi from Aquamist because some damage in the 2D kit might occure at higher pressures? I want to be running the system as effective as possible.

If this info is needed - Currently I am running 0.4mm jet (but I will go to about 0.6mm soon). In addition to the standard 2D system I have a 40cc accumulator installed, and a check valve after the manifod/water pressure sensor (the check valve is between pump/manifold/water pressure sensor and accumulator/HSV/jet)