There is a setting that you can set to ignore outliers, but not sure if it works or not.
Hehe, I tried that already. It doesn't do anything for this specific issue.
According to the documentation:
ignoreoutliers - True or false, will ignore prices that are deemed outliers according to data from the statwindow and certain variables, is ignored when mining by average (default false)
They are not technically outliers but permanently inflated numbers. So it makes sense that the setting won't correct it.