bc u have no burst whatsoever. i tried the rotation where u start off with opening with VT. and i "slowly" built my dps up. now tell me why would i do that, when i can open up with my max dps. getting me to do as much damage as possible. then once the burst is done. i'll ONLY go down a couple 1000 dps on the charts.
start up slow. or start up huge. thats your decision.
plus with my opening rotation. your bound to get Empowered Shadows. which is a huge dps gain. or loss in your case. that is why my opener is better.