Incidentally, on the page listing 'New' and major changes for w2015/16, it has RYR as 6 x daily. I thought it was the same for s2016 but the schedules on the RYR web site were now only showing 5 x daily when I checked again recently. (edit: yes, the 15.15 departure in winter not showing for s2016).
Just to come back to this, it's only June, July and first half of August showing 5 daily Dublin. All other months up to October 2016 are showing 6 daily.