How to read SimulationCraft results to find out why my dps is low?

https://drive.google.com/file/d/0B6nVqD_t8n4IQ0VRYkpnTVc5Wlk/view?usp=sharing

No matter how much i try to follow dps guides i always seem to be getting low dps with my arcane mage (ilevel 871 getting <200k consistently). What am I doing wrong and what can i do to improve my results/gear?