When selecting deadlock South America server I get the best ping options all from European servers. I guess the Deadlock SA server is set incorrectly somewhere?
If I checked this issue correctly, it looks like measuring RTT to SA server is wrong. When you get a chance, please send us some game packets using Packet Capture with Mudfish link. I need some game packets to analyze this issue.
Hi, I captured and uploaded packets. It created a private support ticket, I think
I’d left my answer on the packet dump topic you uploaded at Private Support menu. Please check it there. 
You can find your topics at https://mudfish.net/forums/iwrote link.