Watch the Not So Quick! online guitar lesson by Brad Carlton from Chord Studies: Evolving Blues Vol. 1
Now we get rid of the "quick change" however we do have an A13 and the surprise comes in measures 11 and 12 where we are moving to a C13 chord! Some of these changes may sound foreign to you but don't worry, with enough practice you will start to pick out the different notes in these chords and be able to hear them so when you are soloing that spice will be there!