Results were computed by parsing chat logs with Mojo.
All measurements were made with the same toon with the same buffs and equipment. The toon was a Saracen pally with 50+16 shield, mastery of blocking IX, a greater barricading mythirian, augmented dexterity IX, and 10 points of PvE block bonus. The toon's buffed dexterity on Pendragon was 373; on Gaheris, 383.
The experiments against a single enemy were done with the Slash test mob on Alb Pendragon. The mob was reset before each trial and told to set itself to level 75.
The experiments against ten red/grape mobs were done with finliaths in Breifine on Gaheris.
The shield was an Arcanium Sentient Tower Shield. For the 70% trials, the shield was at 70% the whole time. For the 100% trial against one mob, the shield began at 100% and finished at 70%. For the 100% trial against ten mobs, the shield was repaired every hour and remained at 100% the whole time.
(How did a paladin equip a mid shield on Pendragon? The shield was equpped on Gaheris. Then the toon was charcopy'd to Pendragon.)