This is very interesting. It sounds like those who were more distressed by the psychotic symptoms had some paranoia thrown in; maybe that's why they were so distressed? Or perhaps they were just more prone to thinking that others were out to get them (in a non-clinical way).

On the other hand, I wonder if this points to a possibility that Cognitive Behavioral Therapy (or perhaps another form of psychotherapy) might -however counterintuitively- help with psychosis. According to the article, the way you think of these experiences changes the way you experience them. It sounds to me like therapy would help with this.