“We need to coach them better. They absolutely need to work harder, work smarter and execute more cleanly.”
Uh, no. Mark, the biggest problem is that the team isn't aggressive and isn't playing with fire in their bellies. Your answer to everything is always 'we just need to use our brains more'. Stop telling them to be calm and think. You've turned my team into a bunch of weenies. Try walking into the locker room and breaking something. Try anger. Try admitting your approach needs tweaking, and perhaps years of nepotism is catching up. 

The team is playing without fire or personality, and not truly accepting blame and responsibility. Sounds like a coach I know...