Every time I hit a wall (which has happened 3 times since hitting 80), I sit down and rethink 1) my healing method 2) my dps macros and 3) my specialized functions (i.e. cleansing/purging/removing poison/aggro shedding) controls. Maybe comb through things. In my experience you can either use brute force (like I do in heroics with near 5k GS) or manage fears, magic and other debuffs to make your way through the heroics.