nice revisions. the capstone still doesn't strike me as capstone-ish enough. i'd put all of that stuff into lower levels–break it up some–and then give a powerful maneuver as a capstone (stances are especially nice, but strikes, boosts, and counters might be more flexible).
the maneuver should belong to whatever discipline you are specialized in, require a skill check of the appropriate sort, and then give some sort of cool action or ability. making the effect the same no matter the discipline would be the easiest of course, but wouldn't be very flavorful.
you could do this (using a boost as an example):
all attack rolls this round deal an extra 5d6+1/initiator level damage; further, you gain a special effect based upon your mastered discipline.
desert wind: cool ability
devoted spirit: cool ability
diamond mind: cool ability