I have a .25 mk2 bobcat im trying to tune for the 34gr heavy jsb. on factory reg pressure i adjusted hammer spring tension and could only get 800fps shooting for 830-900fps. I removed reg gave it like 1/8 turn. now i peak at 820fps with hammer spring in about half way. if i turn it in more i lose speed and efficiency. And now when i remove my air cylinder i loose air pressure in the gun. Bofore i rook it apart it would hold pressure and i would have to bleed it off. Im new to trying to tune a reg any help would be awesome