Watch the BBQ Boogie online guitar lesson by Jeff McErlain from Essentials: Advanced Blues Rhythm
The second variation on this groove uses some very common voicings for minor seventh chords. It's important to keep the intensity of the song going while bringing down the dynamics. This is especially important when playing with musicians in any live situation; you always want to be looking at each other and making eye contact. This keeps the music a living and breathing thing. This is essential to being a good musician, especially in the blues. So, as you go through the song, experiment with playing with more or less intensity.