The cue Eddie Bishop sent my son has a taper where it goes inward in the handle area, I guess you could think of it as a very slight hourglass taper if that is what you are talking about. It's fatter to the end of the butt, goes narrower to the handle, then slowly grows again past the hande. Really nice to grip that way and the ballance ends up great with the weight.
I know Eddie pops on the forums every so often maybe he will add some details