If someone is using cheats, it's usually because they are not very good. Congrats at being good at the game.
I'm not sure whether or not I have experience stat manipulation, but I highly suspect it. There are games where it feels like I'm playing against two brothers. Little bro starts the game and I score 1-2 goals. Then it feels like he handed the controller off to big bro because all of the sudden he's intercepting every pass. My defenders can barely play it out of the backfield. After he ties the game or even takes the lead, he hands the controller back to little bro.
Again, I'm not sure if this is a player cheating or EA is putting their thumb on the scale to keep the match competitive.