It's good that you're able to find the trick 
i suspected the issue is related to internal (game specific) timeouts which can't be tricked by socket's timeout, you will need to find where these timeout values stored and increase it.
If there are better ways (than patching) to simulate an accurate internal timeout on inconsistence FPS, it should be able to solve similar issue with other games that have disconnections issue.
i suspected the issue is related to internal (game specific) timeouts which can't be tricked by socket's timeout, you will need to find where these timeout values stored and increase it.If there are better ways (than patching) to simulate an accurate internal timeout on inconsistence FPS, it should be able to solve similar issue with other games that have disconnections issue.
PPSSPP Multiplayer Guide: https://github.com/hrydgard/ppsspp/wiki/How-to-play-multiplayer-games-with-PPSSPP