I did manage to fill both of my Iowa tags (1st and 4th) but is was a lot of work. I guided for 5 hunts and was unable to get one killed that way. One guy missed (4 times on two birds [:@]) and my son passed on a marginal shot, but the others were total zeros.
I chalk it up to a combination of factors. One, I think numbers are down slightly. Two, the weather sucked. And three, that's the way it goes.