Shadow Priest - Poor dps

Hey Guys

I'm having a hard time coming over 5k dps on target dummy, and generally doing low dps in dungeons/ raids, How can I improve?

Here are my armory: https://armory.warmane.com/character...daeron/summary

My opener is VT>DP>MF (3 ticks)>SW:P - Letting my ticks run out before I recast. and using ElvUI to track timing on dots etc.

I know I'm a bit low on haste, but should I gem for haste instead of some of the spellpower gems?

Any other advice would be appreciated.

I have read the guids, and watched some youtube videos, but I can't seem to get any higher on the dps meter, please help a fellow priest :)


Greetings
Priestella