Well, I've read further and Enishi doesn't freak me out nearly as much anymore.
Match his behavior with his reactions to the reason for his behavior and he doesn't grate on me nearly so much. I think my biggest problem with him was that even when we were showed him thinking about Tomoe's death, he still looked smug, and it felt unpleasantly to me like he was just using her as an excuse.
But showing his very real instability and pain made the mania Tomoe's death caused him feel genuine, and he feels, honestly, less like a smug, calculated supervillain and more like a child trying to beat away what hurts. Battousai being far away doesn't ease the knowledge any, so he's blindly hoping that killing or hurting the man who killed her will ease his own pain of being unable to save her.
I'll never like him, but now I think he's a bit more heartbreaking than repulsive. I mostly just wanna rewind time and toss him at Tomoe for a hug, or something. DAMNIT.
I dunno, maybe I can be a semi-analytical reader after all...?