BTW I beat AAA legit today. I am uber when it comes to DD.
Here is how to get a good score:
1. Play on hard
2. Once you and the computer are even scores (IE both have the same amount of cards) purposely lose a round
3. Try to keep getting the 5 cards in a row bonus
4. If you see you are about to win too quickly throw another hand
5. repeat steps 2-4 till you get the score.
I did it legit on Easy, it's just very tedious...