for this specific set in easy mode doesn't (bawds, chefs) result in unique responses for all of them? so that's 2.5 guesses total? Where are you getting the EV for 6-word sets?
You're right: the EV is 2.5 (my guess was pessimistic). For (almost all) 6-word sets, there's a single word you can use to delineate all six words, which gives an EV of 1.83 if that word is in the set and 2 if it isn't.