Hey all! 
 
Thanks for reading my post.
 
I have tried to assemble a weak auras while using Plague Leech, Blood Tap and Defile as my talents. I just want someone to try it and review it and tell me if I am missing something or there are some irregularities.
 
Cheers for the comments in advance.
 

logs: https://www.warcraftlogs.com/reports/tfgT7pBvW36NH91F#type=damage-done&source=17&fight=6
 
armory: http://eu.battle.net/wow/en/character/sylvanas/Anf%C3%A1uglith/advanced
 
Any suggestions as to how I could improve? 

Also, I have a question about Dark Transformation and Blood Tap. Should I prioritize Death Coil over rune capping when DT is off? Is it sub-optimal to recharge an Unholy rune with Blood Tap in a single-target rotation?