do u have a chrony? If you never tuned a pcp, you would find it beneficial to team up with a buddy that can walk you though it. It’s simple, but takes time and patience. Best done in certain sequences.
Depends on your barrel length I haven't tuned a m3 but 150 on the first reg I would say and if it's a 700mm I'd try a 110 on second reg as far as power wheel and spring adjuster micro wheel you'll have to play with it on a Chrono
Want about 900 about or tad higher I'd start with the front valve adjust a full turn past the 4th line and slowly turn the valve adjuster in to get a slower speed settling around 890 to 900 then chack accuracy hopefully someone with more experience with the platform will chime in