So the difference between the pings is because they add things like processing delay etc. All games will have it, some choose to include that in the ping calculation and others don't. There is no way for a user to minimise this, its just a part of the game. The Geo-Filter shows the ping from the router to the server, thats what you can control with the Geo-Filter and QoS. So I would only worry about the Geo-Filter ping as thats what you can control.
There could be lots of variables on why t