Homebrew Monk subclass: Warrior of the Blade (a revised Kensei for 5.5e)

Hi, all. This is my first real go at making a complete subclass, and I'd love to get opinions on it.

Upfront, I'll say that my design philosophy was basically that the point of the Kensei fantasy is being a supreme master of a chosen weapon, so the subclass should feel like it's all about the weapon ... and not, say, just holding the weapon while only actually using unarmed strikes. I also intentionally avoided expanding the options beyond Monk weapons for two reasons: one, for simplicity, and two, to avoid potentially powerful interactions with things like Great Weapon Master.

Anyway, enough rambling from me. Here it is.