Anecdotally (i.e. based purely on my own semi-frequent use of the route and others I know that have used it) there has been a big upswing in loads on the Edinburgh route this summer compared to the last time it ran. So much so that they have been leaving bags behind for weight reasons on quite a few occasions. The only caveat on that is that it is based almost entirely on Friday, Sunday and Monday flights, so the increase to six flights per week might bring down the overall load factor if midweek flights had low loads.
The route has now gone to five weekly for October and then four weekly from November onwards for the winter season. I would expect the route to struggle a bit in the quiet months after Christmas.