As a bandleader, I think it's important that we rehearse, develop repertoire and refine our ensemble sound and style. At the same time, I try to emulate the Miles Davis approach: hire the best cats, give them lots of freedom, and embrace the music, wherever it leads.
I'm working on eliminating nonsense phrases from my improvisations -- the musical equivalent of "like," "ya know" and "umm."
There are certain cliches that I tend to reflexively insert when grasping for the next idea. I'm training myself to embrace more negative space during those searching moments -- to simply be still and listen, to just pay attention, rather than compulsively fill the space.