His only above average skill is his LH split.
When he pitches against RH batters, his split is average, his control is below and his pitches are below, so he will get crushed. Which he does.
When he pitches against LH batters, his split is good, his control is below and his pitches are below, he will not get crushed as bad.
If he has to be used, it should be in situations where his skillset allows for the biggest chance of success. That was my point, by design.