What happens if you just enable Dominos + Dominos_Config?
Its on my list.
I don't have a good way to turn it off when in a vehicle at the moment.
Dominos_ActionSets is meant for this use case
/dominos -> Check Use Blizzard Override Action Bar
That's more or less a Blizzard thing.
That is probably due to another mod you're using.
Uncheck Use Blizzard Override Action Bar in /dominos. I changed the default to enable it because the other way doesn't work properly in some of the new raid encounters (in a way that I can't really fix nicely).
Try enabling the Blizzard Override Bar in /dominos