Paytables where the flush pays 6, and paytables where the flush pays 5. I believe there are two significant classes for DDB though for most players. Hopefully JB can check this for me at some point. Unfortunately I am not as much of a VPGenius as JB, but you can roughly piece together a DDB Strategy by using the Bonus Poker, Bonus Poker Deluxe, and Double Bonus strategies JB has listed. Do you have any variance numbers for this game too?
I would also be very interested in DDB strategy.
