You're kinda missing an attack in your first rotation which is making you lose out on damage. Whether it's another BS (Which it should be) or not is left to be decided. Also note that with Unholy, without Reaping becomes better DPS than with Reaping at some point, and then switches back to be around equal. It's up to you to see if your gear is about the same level for that. My guide, I believe, explains at what point you wanna look into that. I believe it's around Tier 10, two pieces.