I used the three alchemist team, too.
My final setup was:
Weapon: Veteran Skills, Fatal Pain, Eco-Skill, MP Cost Pack, Rainbow Power
Armor: Special Guard, Elemental Guard, Hard Coat, Sonic Move, Life Guard
Speed Belt: Night Essence, Flame Essence, Elemental Guard, Stats Power, Speed Star
Angel Charm: Veteran Skills, Night Essence, Elemental Guard, Stats Power, Speed Star
Infinity Meteor with Godbreaker, Rank Special, Single Bonus, Ultra Quality, Loner Slayer L
I have breakdowns of how to craft them and transfer traits if you want. I farmed the items for crafting from the area in the Abyssal Tower where Ozean Kaiser is.
I didn't write down what I used for my Elixir, but it had Pepped Up, KO Recovery, and also increased Max HP. I also used an Absorb Gourd to reduce the enemy's level and stats. Pinwheels are helpful, too, especially Meruru's Pinwheel skill with some nice Skill+ equipment. I have a
YouTube video of my Machina Domain run here. It's from my first win through the dungeon, so my equipment is weaker than what I ended up with, and the battles are kind of long because of it.