I use a set that is very easy to put together:
Agwu's Axe,
Nyame Head and Body, Gleti's Hands, Legs, and Feet,
Adad Amulet, Crepuscular Earring, JSE Earring (NQ, +1, or +2 is fine), and an Ambu Cape with as much Pet Magic Accuracy as you can get. I put on Moonlight and Defending Ring for extra DT- and Platinum Moogle Belt for extra HP.
No RP is required on any of the gear to work. No reforging necessary. This set works without fail even on a fresh L99 BST (no JPs, no master levels). Just make sure to use Rolanberry Daifuku and to engage Bumba in order to trigger Tandem Strikes before spitting on him. For spitting on other NMs, you might beef the set up, but for Bumba this works great.