I'm using Relentless Gladiator's Belt of Triumph and Relentless Gladiator's Dragonhide Legguards because they are just better then any other ilvl 245 gear in those slots (belt/legs). The pvp legs are even better than the t9.245 legs. They have more stam/agi(=dodge) but less attackpower so treat is a bit lower. But still they make me a better tank imo. But wow-heroes seems not to give me credits for it. I know most pvp gear isn't good for pve raiding but there are some exceptions like this. I hope you can fix it so my ranking is where it should be. When I equip my t8 legs and crafter ilvl226 belt I get higher score, which is not right imo.
One other thing: the ilvl 245 Idol of Mutilation will probably give higher score then the ilvl 226 Idol of the Corruptor. But Corruptor is actualy better than Mutilation for tanking (153 agi > 200 dodge with kings buffs and other stats multipliers) is this taken into account too?