The Feast party formation should be based on rating AND job type, not just rating

[kensatsu]

i think like you, a gold heal should not fight a bronze heal for exemple. but it happen.
But like said before sch shield is not take in the final result.
If you see whm result to be 2 times the sch result in a match, it's normal.
But there also a issue you may watch as bard with the Sch.
If the Sch spam a lot Aldo shield , the mana will drop fast.
I suggest you to expect this, you may use your pvp regen mana skill sooner in this case.