Diana More ?s on Diana Stormrider Gen3- regulated

So, I finally decided to disassemble my Diana Stormrider to see if I could tinker with the regulator to get a little bit more accuracy. As shown in the pic, factory setting is where I've marked with black. Since there are no indicators to tell at what pressure/bar it is set at, how many turns do you think would be needed to raise or decrease the pressure/bar?

Thanks in advance.

Note: I've already drilled the transfer port to a 2.5mm size hole.

WhatsApp Image 2025-02-04 at 21.31.05_46368786.jpg