Some changes to Bluestar from last Sunday including more time allowed for the 11 and 12 round trip (1hr05 rather than 1hr) presumably for reliability reasons.
However the journeys I've observed (only 4, all between 1030 and 1100) still seem to do what they generally used to in many cases, i.e. form the next 11/12 out of Southampton following their arrival. This means only a 5-min turnaround time which seems like a reliability risk.
I think I was expecting the journeys to "step back" to have a 15 min turnaround at Southampton with 8 workings rather than 7, which would significantly improve reliability (with the caveat that the routes are not entirely self-contained and occasionally interwork with the 4, 8 and 9).