Can you look at making some quest requirements soft again? Mostly the Family Crest magic requirement, as skillers could dart the boss because the magic level was only a recommendation, but not anymore because they can't even start the quest.
That sounds like a case where the Magic requirement could probably be removed from Family Crest, if it's not a hard requirement to progress.
Don't you need to cast each of the elemental Blast spells on Chronozon, and therefore need 59 Magic for Fire Blast? How are skillers getting around that?