Here's the Am groove backing track. Remember that we're using the two sus4 chords built from the root and b7 of the scale, so in this case:
Asus4 and Gsus4 from the Am pentatonic scale.
Use these two chords in all their inversions for your comping and soloing. I'm sure that in no time you'll find yourself relying less and less on standard chord shapes and pentatonic boxes!