What's the rest of your CB team?

Generally speaking shes a better support champ, but you do lose the Dec def from Tayrel so depends on the whole team.

Ghrush, Ninja, Dark Elhain, Tayrel and Skullcrusher.  I do about 85,000 on a 3 key Ultra Nightmare

you've got ninja providing def down, so it should be worth it to replace tayrel with ss. you also should look for someone to replace dark elhain, as she's pretty rubbish for clan boss. post a picture of your roster and maybe we can find someone better.

I also have another Painkiller 

You have no poison.  Dark Kael is an awesome poisoner for Clan Boss.  He is a clear upgrade over Dark Elhain.  So is Anax.

Might be even better to bring in Farakin and run a combo CA/AA.        

I think you could pretty easily get to 2-key, especially with the CA/AA combo.  

I'm sorry, I am running with Dark Kael not Dark Elhain.