IMO it's a case of going through something you've never gone through before & learning to deal with it.
Back in the 1960s there was a guy in the Baltimore organization named Steve Dalkowski. People who saw him pitch claim he threw harder than anyone. Ever. He walked a ton of batters & never threw a pitch in MLB. There was another pitcher, a little younger, who was reputed to throw almost as hard. He also walked a ton, but made it up to the show, added a wrinkle or two, and grew up to be Nolan Ryan.
Thing about Miz, he already has the wrinkle, actually two or three of them, at a very young age. I believe it's just a matter of time for him.