@Halfak mentioned recently that the ORES filter thresholds may need to be adjusted every time the ORES models are updated. That would apply both to the filters on Recent Changes (and other pages in future) and to the standard filter ranges that we're building into ReviewStream. These would presumably need to be adjusted individually for each wiki on which we implement these systems.
Clearly, if we understand this correctly, it's not something we want to have to manually manage. We need to look into this, see if it is indeed an issue, and devise a system.