I've seen many countless threads regarding this issue. The only one showing a "fix" is simply to roll back the driver. I am using a monitor that doesn't have DVI sadly or I would just switch to that but I remember back in the CCC days there was a way to fix it there. Radeon Settings seems really over simplified and doesn't offer any scaling options for underscan (just overscan). I haven't figured out a way to fix it with the monitor as Radeon Setting suggests.
Mainly I would like to know if anyone has had success with registry fixes for this issue. I have seen some guides for different models of GPU but things are just different enough that they don't work for this model. I can live with it if I have to but it's really disappointing that this is such a small issue that used to have such a simple fix in CCC.