When the 4p bonus was originally changed I grabbed 251 tier fro the vendor and ungemmed/enchanted my PW:S was absorbing more per shield than it was with the 264 offset (badge and 25 man drops). I found it absorbing more though looking at WoL for the tests and looking at recount and skada. Again, that was with *ungemmed and enchanted* 251 tier, I upgraded the 251 tier to 264 and gemmed it and I noticed a huge jump in my absorbs from each shield. I think the 4p is pretty much a must have for disc, but thats just IMO.
The only sovereign you can allow to rule you is reason. Talga Vassternich.