The best advice I can give you is not to use a Diabolos UN team unless you are very, very strong, and from your SSRs, you certainly aren’t. Focussing on one element forms a far stronger team; having just one off-element e.g. Ryu-Oh for debuffs can reduce your total damage by around 20% (don’t quote me on that) and even more during bursts. Having two off-element means splitting your grid or risk having two members of your main team deal less damage, even if you do have the buff from Diab UN. Plus, if one of the off-element dies, I’m pretty sure you lose the buffs (at least the attack one).

As Kitty states, “Rainbow grids r dumb”. Read up on sanahtlig’s guide on why not to use Diabolos UN even as an intermediate player.