I'd add some fairy wrasses (use a social acclimation box to prevent issues with the melanurus), I'd put in a blenny or two ... starry, midas, tailspot come to mind - and utilize the environment differently, so may get along better than you'd think. I'd maybe try a harem/trio of royal grammas, and would certainly add some shrimpgobies - preferably with a pistol shrimp (Edit... barebottom, I might leave out the shrimp). I might add a Watanabe's angel which is pretty darned coral-safe, or a flame or coral beauty which are a tad more risky. Might add a small group of mellower anthias, as well, possibly a copperband butterfly, and a bristletooth or smaller Zebrasoma tang. I'd also consider a bonded pair of firefish or a small group of zebra or blue gudgeon dartfish. I'd think about small groups of azure or Talbott's damselfish, two of the mellower damsels.
~Bruce, who has some of these fish dancing in his 220 ... and all of them dancing in his head!