A semi-fix I found is to use up around 80+% of your bandwidth. If I play with no network traffic, I'm at a disadvantage, so I've found running a torrent client with uploads and downloads limited to 85% of my bandwidth helps. Or you could try opening multiple YouTube videos so it uses most of your connection. As long as you do something that makes your connection almost bottleneck, it will help as, as you've said, awful connections are an advantage on FIFA.