Tuning So close to SD of 1.4 after 17 shots.

I get 17 shots out of my 30 Compact with 44.5 hybrids before falling off the regulator. I was testing after raising my reg pressure 5 bar to see what it was doing.I wanted to see how it would shoot closer to 925 FPS. I almost had a standard deviation of 1.4 through 17 shots with an average of 919. I had one random 902 FPS at shot 11 that ruined it. Damn I was so close. I was shooting 919 shot after shot with a couple 921 and 923 then that random 902 at shot 11 and 919 after that till shot 17. With that 902 shot I was at a SD of 5.5. Before doing the regulator change I was at a SD of 3 at 903 FPS average. I will shoot a couple more strings and see if that random FPS shows up again, if it does I will drop back down 5 bar.