Great find, James. I’m a great fan of Groove Holmes. Holmes is incredible on On Basie’s Bandstand as well. Besides Groove Holmes, you should check out Jimmy McGriff, Jack McDuff, Don Patterson (especially with Sonny Stitt and Gene Ammons), Big John Patton, and Larry Young. Maybe not all funk but some major players, especially Larry Young.
For a bit of funk, you might like Jim Alfredson. He works the midwest as a sideman and has his own group, Organissimo. Here’s an original he did to showcase the Hammond SK2. I have one and am trying to get a handle on it, a part of the reason I’m here at PianoGroove.