I think it's the timing in the count that he's throwing the pitch that is killing him. He gets 2 strikes on a hitter and throws a few fastballs in succession and then leaves a slider right down the middle. My point is that if they're going to have him throw the slider late in the count it should be out of the zone. That could be on Strop, maybe he's having a tough time commanding the pitch but it's come back to haunt the Orioles so many times I would consider having him refrain from throwing it late in the count.
For most pitchers the slider is harder to control than the change up. Working from a 98 MPH FB an 88 MPH change up with the same motion would be DEVASTATING and could thrown for an "out" pitch in any count.
Sure, you can hang a change up but normally not as often as a slider, and when a hitter has to respect the 98MPH FB they normally won't be able to properly time the 88 MPH change up even if it is a hanger.
If Strop can learn how to throw a change with the same motion as his FB and command it, he would almost unhitable the first time through any lineup.