I think that an interesting way to make the master tactician more, well, of a master, is to allow a kensai fighter to cycle through their tactics faster than a barb or monk would. This would serve as a good way to improve the capstone, making the pure kensei the more powerful tactician. Much like how sorcerers cast faster than a wizard does, a fighter ought to land his stunning blow at a higher rate than the other competing classes.
whaddya think?