Yep, this nibbling ******** worked last September because opposing teams didn't expect it and his control actually was pinpoint, so he didn't miss the corners.
Now that teams have the book on him, they sit 2SM and BABIP him around the field. It's incredibly frustrating because his stuff is nasty and should play better than this.
He has similar stuff to Jake Odorizzi (only with much better velocity) and should be executing his pitches in the same way. Their MiLB stats are very similar, and they have the same pitch selection, only Jake has actually executed the same way he did in the minors with a natural regression due to the competition, while Stroman has become a completely different pitcher and is now being BABIP'd to death as a result of it.