Alright, so i finally fixed my hicapa, it kicks hard, shoots fast, and very accurate now. My FPS is around 335-345fps on 0.2g, and 275-290fps with 0.3g. I tried swapping each individual part with stock parts and fps is around the thing and its consistent. Im happy with where it is at and im not going to tinker around with it anymore, but I will chrono my gun at least once a week just to make sure the FPS is consistent.
Anyways, when I was taking apart my gun, the piston screw was slightly loose, so I figured that it didnt compress the piston oring as much, causing a bit of gas leak which lowered my fps. Anyways, I tightened the piston screw and added some locktite to keep it tight. Also, when I was testing it after several rounds of disassembly, check out what I found:
Theres a nice even, concentric hole in the middle of the cylinder bulb. This cyliner bulb supposed to be better, but I have no idea how this happened. So im right now, im just using the SD POM cylinder bulb, with my SD POM nozzle and SD valve blocker. The stock cylinder bulb doesnt bounce back up in the nozzle for some reason, so im just going to leave it as is right now.