You may be interested in checking out Griff's new blog post (email link 5-19-17 "No.Scales.Allowed.). He takes a "new" approach to the "4 Notes". http://bluesguitarunleashed.com/blo...ent=2017-05-19_no-scales-allowed&utm_term=all.
His email message today on Roots and Octaves is another nice push towards the SWS approach. http://bluesguitarunleashed.com/blog/roots-and-octaves/ I like this approach and find that it's helped me learn the fretboard and start to memorize the notes.