Tomorrow is gonna be a hell of a day.
Well, it's depressing, but it's good to know. I'd say 4A pretty much requires the PO BE as well, since everyone tries to attack you out of PO. I guess you could go for PO A:6 though.
Maybe the best followup for A+B is 4A+B6. Then you at least have PO mixups. It's a shame you can't combo anything off of it now though.