I feel the pain also...
Got T7 Shoulders last night as well as the gloves from Faerlina. The T7 was fine with +3 defense over Pauldrons of the Colossus, but...
Daunting Handguards: 71def + 16def gem = 87 Def
Gauntlets of the Master: 38def + 16def gem = 54 Def
That was a huge ding to my defense, bring back down to exactly 540. I am only a few badge away from T7 Chest, but the defense loss from Breastplate of the Solemn Council is going to drop me below 540, with gemming two 16def gems in T7...
T7 Chest: 38def + x2 16def gem + 22def enchant = 92
Breastplate of the Solemn Council: 76def + 22def enchant = 98
I think it will all become a non-issue if I can get my hands on a WotLK Def trinket like Seal of the Pantheon. That will create a nice cushion in the defense department.
Note: Blacksmithing is worth every piece of copper; I wouldn't know what to do without the extra sockets

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When an unstoppable force meets an immovable object...