Here's what we decided. We decided to fill in the hole a little after half way and then mound the dirt around the bush. It would be lifted out of the wet area and we are hoping it will be OK. We will mulch around them to minimize erosion and try and retain some moisture without soaking them. The three other bushes we planted last year have survived, so we press on.
The above video shows our secret hole digging weapon. Fortunately for us, he likes to dig for and eat worms. Getting him to dig in the right spot is the challenge.