That adjustment to is not exact. What my gun needs may be completely different then yours. Still there is some good ideas on where to start. Your other option is to lower your fill level. If it starts shooting at 190 bar fill it 190 instead of 200.
All I can tell you is that it took a good bit of work, and I've lost how many turns in or out from "issue" it took.Basically filled the cylinder to my projected top pressure (in my case, 2900psi).Shot the rifle over a chronograph looking for a slight rise in velocity in the first shots. Keep shooting until it rises, peaks, and starts to fall off in speed. Ideal is to have it to rise up to about 4% less than whatever it's peak is, stay very near the peak speed for a number of shots, can cut off the shot count once it falls back down to 4% under peak speed.(The above sounds easy when I type it...but it's a lot of fiddling around and shooting to get there. If it starts out fast, then you've too much striker tension. If it starts out much slower than 45 under it's peak speed, then you have too little spring tension. Not shooting at all would count as "too slow".)If the end result (starting about 4% under max, peaking at max, and down to 4% under max) isn't fast enough for you, then time to look into modding the valve stem/improving air flow.
How did I miss this thread? I have one in each caliber and love the way they shoot for $139!!!Have only modified the grip so far on the .177.I really don't want more power, just consistent velocity and accuracy! Also would like to go HPA and a regulator.