I finally got it down now. Think I was just off my game the first day figuring out the encounter.

The strategy I use is to stand 2 DPS up on the crates near the fountain- you get on them by the ledge. Then I put my healer up on the fountain and final DPS w/e generally on the lower fountain edge.. Them being off the ground buys me some time to get Hummel down and then go for Baxter the green guy.

If you get Hummel down then you can pretty much solo the last 2 guys if worst came to worst. Just keep moving! The lack of aggro table on Frye fairly guarantees my slaves will be dead by the end but usually 2-3 survive and have had a few flawless victories now.

Got the mask-wasteling and seen every necklace so far... Now just need that rocket! Geez I'll totally freak if that thing drops lol.