This story may sound strange, but bear with me:

I've been taking private lessons from a very skilled instructor.  He used to have several students, but then his wife got cervical cancer and he only kept me on as a student because he didn't have time for lots of other students.  I've been with him for some five years now, I started playing guitar from scratch.  His wife has since died, we kind of went through that shit together.

My goals were to be a Blues player of all sorts (Delta, Chicago, Piedmont, etc...), I told him I wanted to be a guitarist, not just a guy who could play a few songs.  He took that to heart and made sure I never really learned any songs specifically, but made sure that I understood why and how the notes were played when they were played.  Now I fear that I've got a Swiss cheese knowledge of theory (I have the minor pentatonic scale down great, but the major scale and how to integrate that is still a mystery), can play lead to anything bluesy (especially if it follows a traditional I-IV-V, or something with a quick change, or maybe  I-IV-V-VII, etc...), I can pick up on any blues tune in any style in any key.  Outside of that, I struggle with using moveable chords, I only sort of get the circle of fifths, struggle using the whole fretboard, getting out of my rut, etc...

I have heard that chatting with a new instructor can be a huge benefit, because I don't think I'm getting anywhere new with my old instructor...  even though we have become best friends over the years.  I think I need fresh talent to help me continue to grow, but how do I make that break?  How to I find the right guy?

Of course my goals have grown to become more than just a blues guitarist, but blues is still my underlying passion.

Has anyone else gone through something similar?  Do you have suggestions?