This late in the season, just about everyone has gear. Even low rated teams will be using gear from their 3v3 or 2v2 or from Ulduar, so it's getting tougher every week.

Just keep filling in all your slots with pvp gear to get your resil/hp up (20k hp and 700 resil) and play different nights. Sundays seem to be one of the hardest nights on at least a few battlegroups, for some reason.