One tom is more than enough for 6 hens. Once I know a tom is a poor breeder I will not use him to breed my hens to make sure he does not pass on his genes for bad breeding.Maybe the saddle would be an option, but I have 6 hens, and 2 toms.
One of the most common cause of injuries to hen turkeys is having multiple toms in with the same hens. The injuries occur when one tom knocks the other tom off the back of the hen he is trying to breed.