I keep wanting to break the mold by going with Fear Incarnate on Ravos instead of Insatiable Hunger. However, the few games I've played with Fear Incarnate didn't really seem to have enough punch. Additionally, I worry that with Fear Incarnate, the inclination is to maximize morale tests, and that leads to just spamming things. The trouble is that if you focus on generating lots of morale checks (for example, you have a couple Psychosis Sirens), then your offensive power dips considerably as soon as Ravos dies. But if you keep Ravos back, you're not getting use of his 45+ points.
What are your thoughts on Fear Incarnate? Has it worked? Does it work? Can it work? If you go with Fear Incarnate, are you required to go with a panic/morale test army?