So... you lost 5-1 against a decent team, playing a decent formation and probably decent tactics. Nothing extraordinary from what I can see.
Home advantage didn't count because you had so few fans.
How does that lead you to conclude that the other player is a hacker?
If I was hacking this game, I'd have a team of 1* players in an illegal formation and beat you 11-0 every time. That would be suspicious.