Hmm, maybe I'll try that pressure next. I'm currently running with a HPR about 180. (Had to turn the LPR up high enough to get the SP to cycle consistently - dry-firing that is) The marker works great with the stock ram and the Chaos.
With the SP mod, I can stop the bolt travel by blocking the pull pin easily enough. With paint in the breach, however, the ram vents and often there is not enough force to expel the paintball from the barrel. Or when it does, the velocities are very inconsistent, +/- 50.
This is with my dwell turned up and my rate of fire turned down. Also being fed by a Halo and a clamping lowrise.
When I pull the mod, I can pretty much rip. I'll try to troubleshoot it again after I lend it out next week (I'm letting a girl use it, aren't I nice?). I'm a little reluctant to send my gun to Travis. I think he's a little backed up (kudos to him though for the success of his biz), and I can't bear the thought of being without this gun for too long.