The Dead Ends is brutal for tanks, I end up quitting any random queues for this duty

[ValStryder]

O_O

A tank should never be the healer for the dungeon. That some people consider this normal is horrible.

While this is normally true....the PLD is built to be able to do that without an issue. If you're not doing it then you're not using your full kit and should be ashamed. Clemency at the very least serves as somewhat of a tank cooldown. (GNB gets a 10% reduction, PLD gets Clem - which is actually better imo)

EDIT:
Just to add, as a GNB, with significantly less self healing than you have as a PLD, I have not once had any issue with Dead Ends except on Day 1 when NOBODY knew what to do.