I checked this mine was sliding off so I pushed it back on yesterday but it still does it.I gotcha, I would start here. It sounds like air is getting in to the system, and given how much torque a boosted motor puts out, the motor is likely rocking quite far back and stressing the line which could allow air to enter.
I make between 750-850 depending on boost lvl and yes it feels factory but can have a little chatter at red lightsTry pumping the clutch a few hundred times with the cap to the reservoir removed, to try and get any excess air out of the line.
How much power are you making and do you like the Lethal HD clutch?
Have you gotten any 1/4 mile passes in with the car yet? What tires are you running out back and what are your sixty-foot times? Have you replaced your half shafts and driveshaft yet?I make between 750-850 depending on boost lvl and yes it feels factory but can have a little chatter at red lights