Hi. I bought a fx royal 500 used and without regulator. And when i got it and tuned the hammer spring i got velocity of 935 fps and 20fps spread with jsb kings 25gr. but could just shoot 3 mags befor it dropt to much out to 100 yards so i ordered a regulator and drilled and mounted it. And now i cant get over 885 fps. I have tryed to increase regulator setting to 155bar but o just get 5 fps. And if i increse hammerspring tension more it drops in fps. It was real accurate at 935 fps with kings. So i would like to get atleast 915 fps with kings. Anyone ho has any idea what i could do? Thanks.