The basic premise of a Dragon Flagship build is to use Eng skills to amp your ship power levels to an insane degree.
A D'Deridex has 6 Eng Boff skills. One Boff Station is rank 4, the other rank 2. My setup was EptS1, EptS2, EptW1, EptW2, Aux2Batt2, and Eject Warp plasma. In combat, I just keep cycling power level buffs to keep my weapon and shield power as high as possible. You can have Aux2Batt active at the same time as EPtX, so it gives you a double stacked boost.
Ah, thanks, I'm familiar with the Aux2Bat thing, I just never saw it called dragon setup before.