I know the lick as well...(I own the video) He's palm muting that pentatonic lick(well kind of anyways). The best way I have practiced that is to play the whole pattern up and down the neck. Also try practicing it without the muting. After awhile of practcing it you can't help but come up with different variations yourself. The most important thing to do is to apply what you have learned in your own solos.

I'm currently in the process of making an instructional video for my students wich uses a varaiation of that lick in 1 part of that video.

I also hope to get signed by shrapnel (I live in Rohnert Park (next to cotati)). My guitar tech knows Mike Varney personally (Of course this does not guarentee anything)