I've done those Ice Caves very many ways, but the best is stealthing behind cover (trees) and sniping with bow or magic. Timeslow works for melee, and if you have a Clone spell, you've got it made.
One of the best tips is: SAVE after every Golem kill, and reload if your armor takes too many hits.
One of the most creative ways I ever did it was to lead them into each other's fire and instigate them to get the freeze rays poppin'! They freeze each other as quickly as Rynn.
It's very effective.
You can do the same thing up in Stratos with the Flesh Mage's Golems, but it's a little different. I run around them in tight weaving circles and get them to brush up against one another and strike each other while they're swinging on me. They take lots of damage from each other, and they fall in a heap, leaving one to kill who's already heavily damaged.