Until a FAQ changes any other weapons to have the Specialist Weapon SR, you will always get the +1 Attack for having 2 different CCWs. The Acothyst got buffed unintentionaly. I have to reread the rules about splitting attacks to have different profiles, that seems like a really cool concept.
I was actually thinking about an Gladiator Archon (P. Axe, P. Sword (or Ago), SF, CD, maybe ST.)
He will be able to challenge any model, He will only have issue will be against T5+ with 2+ saves.
”We the unwilling, led by the ungrateful, are doing the impossible. We've done so much, for so long, with so little, that we are now qualified to do something with nothing." - Konstantin Josef Jireček
My Dark Eldar Blog: The Shardnet and Impaler - Dark Eldar Lists