Ranger main hand questions

[darkreap]

So I recently got a Blade of Carnage in a raid. After doing some calculations I came to the conclusion that a Swiftblade of Zek is actually better dps. My calculations are as follows but let me know if you see any errors or have parced these two weapons.

Before I start, I wanted to say that I have swiftwind in my offhand and a dark cloak of the sky. I will always be 90% hasted so I have my calculations reflecting that. Ill round to the second decimal for simplification.

BoC: ((15*2)+11)÷(23÷1.9)=3.39
SBoZ: ((11*2)+11)÷(18÷1.9)=3.48

Does this look right? If so, what is the appeal of the BoC over a Swiftblade? I haven't factored in strength but I haven't found any formula for that calculation.