To be honest, Hutch threw most of his fastballs centre-cut belt high, those are, generally, the easiest pitches to barrel up and scorch for a line drive/deep fly ball. The problem is he doesn't have a high spin rate on the pitch to stop batters from squaring up, like Estrada does. When Hutch was successful he kept his fastball, predominately, at the knees, except for the odd top of the zone pitch to change the eye level. His slider's Sw-Str % dropped as well because he couldn't command the bottom corners like in the past, and hitters would lay off it.
I watched every Hutch start and it was obvious that it wasn't just bad luck, like it was with Loup.