You probably won't have many hound responses since the F/H mode is not self evident. You might as well just test with F/H transmissions into a dummy load to stress test the amplifiers. Keep in mind that multiple streams are no harder on the amp or transceiver than a single stream although it will make an IMD difference. If you need hound responses, use another local computer / transceiver into another dummy load.
Don't forget to test your DXpedition time synchronization method. Deliberately offset your fox clock and see if your GPS dongle or other method properly syncs it to the correct time. A recent DXpedition seems to have neglected this critical issue...
Glenn W9IQ