Watch the Larry's Trick Solo 3 online guitar lesson by Chris Buono from Guitar Lab: Blues Soloing
Just like Sussy Strut, the third chorus ushers in some big changes. In this case, the overall approach of the solo totally changes due to leading min7 chords that act as 7sus4 chords to the primary dom7's. That's important stuff if you're trying to throw in more major 3rds because at these junctures you cannot. At the same time, you can't throw in b3rds either. Upon successfully avoiding these pitfalls you come out with a great sounding solo over some very cool changes!