It seems like pretty much all of Sir Dan's big combos are really hard to land. It's pretty easy to rack up AP with Sir Daniel by hitting people in a sequence, but it's hard to keep it all in a combo.
I might have to see your combo for myself. The best combo I know is only 135 AP, and it's also real hard to land.
AirSideCircle | SideTriangle (No shield, must hit before green hand does) | AirDownSquare | Square | Square | UpSquare | Square | Square | UpSquare or Square
Ehh... Sir Dan combos are hard to put in to written form.