blur, color spray, hypnotic pattern and dancing lights as SLAs would be reasonable, except that color spray is frankly useless at the CR we're aiming for.
Just make them all 3/day except color spray at will, I think. It can use that for targeting henchmen and NPCs and such when it's wants to capture someone or something.
Replace Alertness for Flyby Attack if we want to be really cruel. Other than that, feats are fine.
I don't get much of a Bluff sense from these guys. They're not malicious tricksters, they're just trying to survive (off of the life force of others, but still...)