while i can't see how much tp i'm giving the mob per swing, i can see my own buff list. if my whm friend casts auspice on the party, it removes my enspell. when i recast the enspell, the little marker for auspice goes away.

so unless auspice can somehow give me subtle blow without even showing up on my buff list, i'm fairly certain it doesn't stack with enspell, at ALL.