My friend also had major struggles fighting Master Syo at the end of the Jedi Consular storyline, but I don't think that's due to level scaling issues, unless Master Syo is supposed to be killing her for 17,000 damage. She finally found a forum post online, where she was able to cheese the fight by running over to the cave entrance. But getting killed for 17,000 damage doesn't seem normal or right imo, especially since her stun ability had a way too long cooldown.