Well, you certainly sound good.
Have you ever heard those sessions Joe Pass & Ella Fitzgerald back in the 70's & 80's. I'm betting you probably did, considering the vocal/guitar duet stuff you do. If not, you should definitly check some of them out, it's some of my favorite examples of jazz guitar/vocal duet stuss.
FYI, I also do some jazz guitar duet (and solo) stuff, both with horns & vocals. I just got a nice nylon string made for me by Kirk Sand that I use for a lot of that, sounds & plays really nice.
Later,
Ron