Triggers, lions and eels are aggressive.....the fish you list that you have already are not. I wouldn't mix them.
Dominos are probably the most belligerent of the damsels.....I can't even imagine how tough if would be to add new tankmates to one that's 5 inches long! I think I'd try to catch the domino and trade it back to the LFS. Then you can, pretty much, add anything you want. You have alot of room in the 90......a hippo tang would look great. Maybe 8 or 10 green chromis to school. An angel? Your choices, even avoiding the aggressive varieties, are almost endless!!
Jim