I was going through personal story quests with a friend of mine (Hers and mine) that just started playing the game, and thought “Why don’t lower level people in the party have their levels temporarily increased while doing someone else’s story?”
I’ll use the current situation I’m in as an example:
I’m level 22, She’s level 15. My story is level 19.
My suggestion is party members should be increased to the level of the quest’s owner up to the recommended level of the Quest.
In my example my friend would be level 19 while in the instance for my quest.