The GP agent will always connect to the gateway with the fastest SSL connection time.
So, it could be that one that is being chosen, is done, because it is the fastest.
Can you have someone in a different area of the state, country, world, help with your testing to see?
In your portal configuration (where you identify the 3 gateways), configure them to be Manual, and then commit.
Now you can manually choose which one you want to connect to.
My question is... WHY? Why would you want to choose a different one, other than the one that is working fine?
Why dont you do as @SteveCantwell suggested but create a portal config for yourself.
place it at the top of the list with you as a user then all other users will pick up the auto select one below it.
if you are not able to do this then just modify your local host file and either give 2 other gateways duff addresses or add all 3 gateways but give them all the same address as the gateway you would like to connect to...
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