As much as I would love a hidden effect of increased block damage reduction, it was suggested that this is due to pld's new trait available at 77, Shield Defense Bonus. As for the increased blocking, we'll see as new testing is done.
Just like to note that if using this shield as part of a MDB setup it can be paired with the magian trial Shamshir with 8 MDB to make a total of 13 MDB. Good luck with all those trial mobs fellow PLDs!
When it comes to capping Enmity, PLD has it easy, Multiple JA, Cure Cheats, and Atonement. Easy enough for a seasoned PLD to cap Enmity.
Now, I'm not saying give up on Enmity entirely, Its a simple knowing of when to replace it with something more important. Since its a Shield you can't Macro it without losing TP, so you need to choose between the two.
Its like when Atonement came, Mach+1 was replaced by Joyeuse. You lost Enmity but gained valuable TP.
ive been using mine for past few days in Campaign, im sure there is either a Shield block proc rate + on it, or Damage taken from blocks -.
i take barely any damage in campaign now. with 4 mobs on me i didnt drop below 1200 hp at any time.