I have similar issues however I have not really had many times where DPS has actually pulled off of me. It is DEFINITELY an annoying fight for prot warriors with our current mechanics of reduced threat with better gear
Here are some things you could try:
-Prioritize your Vigilance target carefully on a Lock or non-arcane mage for TPS boost.
- One thing I did was to modify my spec a little bit to allow myself better rage flow by going 5/10/56 instead of my previous 5/15/51 which looks to be your survival spec as well. I found that using the 5 points from commanding presence in improved revenge and focused rage was more beneficial since you may have other warriors that can do Commanding or do it yourself with just a bit less bonus.
- You may also consider replacing your taunt glyph with blocking or revenge to either increase your DPS output or improve your rage situation with free heroic strikes.
I wish they would hotfix rage on avoidance and save warrior tanks from the broken mechanic of being rage starved and doing less threat when wearing better gear. 3.2 is likely still a long way off.