You never need to 'lose' defense rating, just sometimes there are more appealing stats. In your case, I wouldn't worry about it.
Get the neck from halls of reflection heroic.
Get the crafted breastplate of the white knight.
Gett the mark of the relentless ring from toc5 heroic.
Change your shield enchant to +18 stamina. It's a BC enchant.
The gloves enchant is 'ok' at your gear level... but there are a few others like leatherworking armour and stamina upgrades you might want to consider.