I have that same problem too, MNL-ATL. In some cases, the return flight, which has lower demand might even have a higher LF. You may want to reduce prices by 20-25% but it will come at the expense of lowering your yields. On the other hand, you may gradually raise prices later but your LF will fall. It is just about finding the right balance. Also, the return flight does not always have the same demand as the onward flight.
Who has other suggestions?