This does look interesting. Lets see... I think salient warrior is specific enough that it doesn't need the spending of valor points. I mean look at skirmish.
The capstone is kind of boring, but is still pretty powerful. Unfortunately I don't really have any specific ideas coming to mind.
Maybe grant a choice of abilities at level 20, so that it can fill a large spectrum of builds? Or maybe some sort of general boost that you can take for a single battle art to turn it into a signature move.