I finally tried the double-Flare rotations and they work great! I timed them to make sure that the rotation times were correct. So, to reiterate:
Transpose > wait 2s > Flare > Flare
Potency formula: (702 x N) / 12 = 58.5N PPS
where N is the number of targets
Transpose > wait 2s > Flare > Fire 2 > Flare
Potency formula: (882 x N) / 15 = 58.8N PPS
