With PLD's current damage resistance via gear,JAs, and spells it has very high survivability. That's why I think it would be best to lower it's overall damage resistance and give it more DD potential.
Excalibur, Almace, Burtang are all very nice swords to have. However, DD now output soo much damage compared to PLD that it's impossible for them to maintain hate. Most DD can pull hate from a PLD in 2 WSs or the DD have to greatly hold back which should not be the case.
Granted DD should not be able to go all out without pulling hate but PLD should do enough damage that the game moves away from: DD run in WS > DD run away > DD run in WS