AirMaks Arms Krait Standard .22 tuning

I'd like to try and tune my Krait Standard in .22. Running CPHPs. Reg is just below 100 which appears 100 or there abouts is how it comes from the factory. I shoot around or about 30 yards, rarely anything at 50 yards. Pesting small birds or rabbits within that distance. Want to maximize shoot count on a full bottle fill and minimum FPS to take out pests. Typically I just leave as received, but I think my Krait is running more power than needed, so thinking the hammer needs adjusted first? Appreciate some guidance.