Well the tank may not have been well geared, I often see tanks wearing dragoon armor at around this level, and how is your gear?
The healer kiting strategy is not the intended way to do it , and if healer is not well geared or new, or the tank is not well geared they should have done it the intended way, would have saved wipes.
Only thing I would suggest is swiftcast a cure, and divine seal(lvl 40 whm ability) regen, but depending on tank it may not be enough.