Not an expert on fava , but if you are in zone 8 I think they should be planted in the fall ,or now .i have seen them do very well here (wv) .years ago .however my recent attempts have not been good.
They have become one of my favorite street foods in Central America
Toasted ( fried ?) with salt ,and chilly ( of course).
I think thrips got mine,last time.
Would like to hear from successful fava growers, as I too would like to know how to grow lots of fava