When the %s were introduced we had a issue that caused a excess of GKs super-performance, then a update was introduce to cap the skills and make GKs impact less decisive.
Now it seems that with the Playstyles, the config changed and different stuffs changed, like for example, now the internal list of attacking players tend to include MCs... and seems that again, GKs have a excess of importance in the final score... of course IMO it needs a fix.