Leavitt’s Vol. 2 is heavy on chord forms, even though “Modern Guitar Method” isn’t billed as a chord book. It is known for it’s reading and scale work, but there are tons of chord forms, some in Vol. 1 but many more in Vol. 2 that can really improve your comping. He doesn’t get into any heavy talk about voice leading, instead saying something like “smooth rhythm guitar is made possible by knowing as many chord forms as possible.” That’s true. I struggle with voice leading myself, and for the guitar, I do think it’s a matter of figuring out and using more chords, letting the ear help you figure out which voicings lead best from one chord to the next.