Star Ocean 4 COSS Boss

Spoiler Just in Case

So I've gotten to the bottom floor and can fight Gabe whenever I'm ready. Online I've seen someone was at 120 for beating his first form. Is this really necessary to win the fight? I got to the Wandering Dungeon on PS4 but it's been awhile but I don't remember Gabe being that difficult to beat. Maybe I was that level on PS4 but I can't remember. I have Arumat Myuria and Sarah levels 96 to 98 and I'd probably use Bacchus since he's the next highest level in my group probably close to 90. Will I get absolutely shredded at these levels or do I have a chance? I have a decent Valiant Mail for Arumat and Seven Star Cloaks for the mages. I really don't want to level to 120 rn but I will if I have to.