What if you moved Rouse to be after Bahamut instead of before it? Rouse can run simultaneous with DWT, and you could Contagion both. The biggest benefit is it would add about 20 seconds of leeway into the rotation, reducing the possibility of AF being delayed by boss mechanics. Pattern would look like this:

Aetherflow
Bahamut
DWT / Rouse
~20 seconds free time