The Samurai Experiment; because it was terrible before...

[Spiryt]

Haven't read all yet, so few quick comments:

Kiai!!! is obviously greatly favoring high crit weapons. Obviously that's not very big deal, but still favors picks over traditional super-samuraistic katanas.

Two-weapons tree probably won't be really good without TWF fix in the first place.

AFAIR, Whirlwind is not very good feat, and generally not compatible with TWF.

Flash Step confuses me quite a bit. And it doesn't appear to be any good for such high level at all.

Polearm tree doesn't seem really balanced either, +1 to AC quickly becomes obsolete, even if Deflect Arrows is nice.

Vaulted Strike, if I read correctly, allows you to.... jump like a grasshopper and charge at the end of such jump? Requiring TD action?

Pretty terrible if so, not really good for 11th level.

Same with Hurricane Stance - nice bonus, but immobility while doing so at high levels is not good trade off at all.... AFAIU, it's in fact suicide (never really played high levels though).