I've been struggling with getting the velocity up on my clone GT recently. On stock setting it's around 200 fps. I had to bump dwell up to 14ms to get it into 270's range. Even then, it seems that velocity is not really changing when i turn the reg in and out.
I have already replaced the bolt switch oring and the valve o-rings even though there was no nick on them. The gun is not overlubed. I there anything else that I could be missing?