Yoyos would probably outcompete kuhlis for food & make the kuhlis hide a lot. Maybe 1 of the smaller botias would play nicer but I haven't kept them together. Like sids or striatas maybe. I would call yoyos "boisterous", or even semi-aggressive, you might be better off with a smaller loach in a 55g.
I have histrionica in a 55g, kinda similar to yoyos but a little smaller. Very day active but I don't think thay'd do well with kuhlis either, too rowdy.