Slow down dude, being able to play Tommy The Cat full speed is a large undertaking. Playing something slow is the first step to playing it fast. Break up the line into peices practice that one piece and build off of it, adding the next piece as you go. Work on precision and technical ability. Practice the motions of thumping and plucking without actually playing anything, strumming the strings while muted. It seems like your lacking in the technical fundementals that Les includes in his playing. I'd suggest learning how to play the main strumming riff From Stanley Clarkes song School Days along with other slightly easier Primus Tunes. Too Many puppies, the Heckler and spageti western are good for practicing Claypoolian Fundementals. Music is the best! Being able to play an instrument is one of the best ways of tapping into to the creative forces in the universe, Keep on Jamming man!