On these terrible computer speakers (which will soon be upgraded) I'm not hearing problems with simblance. If you are hearing these things, I would definitely not use a small diaphram condenser. Their very fast transient times seam to make the problem worse.
I've not done this sort of genre, but these days I don't feel bad about ass crush fucking the vocal with compression. I'll hit 12dB of reduction sometimes and not flinch. I'm sure this music calls for less, but from what my ear is used to, it could use more than you have. Just a thought. I could be wrong. You should decide that one.
I hear her voice get a little harsh from time to time. Harsh as in a 2Khz kind of way. Not horrible, but it's occassional. Compression may smooth that out. Maybe bumping 100-200Hz some would help (maybe not). I've used a Waves C4 dynamic EQ to decent success with this sort of thing before.
I'm not sure about the space the singer is in. If you are you using a plugin, I'd do something different... maybe less early reflections. If you are not using a plugin, I have no idea what to tell you.
Just one other thought, for better or worse. Why do you need seperation? Are you going to overdub? You should have the balls to at least attempt to get a sound that doesn't need seperation. In other words, have you considered using the 414 in Omni or Figure 8 mode? It may not work, but it may be worth a try.
Let me know if I've totally ruined your recording. Let us know what you ended up doing and how it worked.
Oh yeah, simblance. Turning the mic off axis just a little can do wonders... sometimes too much. You may not have the option, but I've heard stories of engineers lowering the mic to actually point towards the throat. It's deeper sounding and combined with the off axis thing it can really knock off the simblance.