How's your fish doing?
I had a Carpenter's wrasse with the same symtoms. Unfortunately, he died.
Now I have a McCoskers wrasse doing the same thing, albeit not as bad as my Carpenter's. Eating like a pig, great color, but losing his balance, flipping, swimming upside down, etc. This worries me as it seems like whatever the illness is it might be contagious. Although, there was a full month between my Carpenter's dying and my McCoskers starting to show symtoms, so I don't know.
I've done a ton of research and found many post with people experiencing the exact same thing with their wrasses. But no one has figured out what is going on, how to treat it, etc. It seems to be kind of a mystery disease...