I’ve been struggling. My team is now:
warrior (37)
mage (36)
warlock (36)
priest (36)
mage (31)

Even AoE grinding SM GY (currently complete in about 5 pulls) is brutally slow, averaging ~8% per run at ~20min/run not adding wipe time or running back to the city.

Not sure if I can sustain this level of grind to 60. May try adding in kill quests to see if that speeds it up a bit.