In the area of behavior modification, the most, perhaps only, effective means are psychotropic drugs and frontal lobotomies, which may still be legal in some places in New York.
There are so many round people in square roles. Get out of the behavior modification business and get into the talent selection business.
The most effective managers are not those who are expert in motivation, or coaching, or process improvement. The most effective managers are those that are expert at defining roles and selecting the right people to fill those roles.
Look at your team. How long have you been trying to modify behavior? Any wonder why this is driving you nuts. Stop it. Get better at selecting talent, then go build your team.