By "XX" do you actually mean RC, or just "do something next"?
Cuz for no meter, the best you get is actually ASledge->Followup. :^P Well, you can do ASledge, 2A xx Spark Bolt but they can tech (nobody does, though) or if magnetized ASledge, 2A xx Collider for a tech trap since pretty much nobody will neutral-tech.
With meter...unfortunately, 360s add a ton of tech-scaling, so your options after are severely limited:
ASledge->Followup RC 6C Shot 2C Collider (probably won't work on Carl)
ASledge->Followup RC 5C Collider (nearly same damage, just over 5K)
ASledge RC 6C airthrow, falling elbow, land 2B xx Collider for the tech trap (6K+ for the actual combo, but airthrow is techable obviously)