I have looked into articles to get the size of SSISDB down. One good way to do this was set the retention window for logging lower, currently down to 150 from the default of 365 days.
I would like to reduce this to 14 days but would like to be able to keep it at 150 days for packages that log an error.
I think I will have to dig into the SP that runs under the SSIS maint job. Before I do that I wanted to see if anyone has a better idea.