I am full strength specd with slaying and two pentamelds. 16.6k in deliverance and almost 21k in defiance. I run dungeons VERY aggressively and pull in defiance until my hp buffer is gone and aggro is established, then pop deliverance. I have never had a run that stressed a healer, I know because I start a dungeon with "if i suck to heal let me know, I'll pull back" and finish dungeons with healers thanking me for an easy run. Use cds, use self heals, use stances appropriately, and your fine in full strength.