Two possible aproaches:

You switch off smooting in the properties of your object, or you can change teh smoothing angle to make it behave better.

Or, if it's a prop without much morphs, open it in an editor and add some edges to the misbehaving parts of your model.

A ship in port is safe; but that is not what ships are built for.
Sail out to sea and do new things.
-"Amazing Grace" Hopper

Avatar image of me done by Chidori.