Your team ovr compared to the other team messes with how the teams play against each other.
I recently switched my squad up to try and reach 45 cardinals players. I don't use WR's(i run te's at wr) and i don't use any Lb's(i run dime with a saftey at MLB) so i subbed in low ovr cardinals players at those positions which brought my ovr down considerably. When playing i use the exact players on the field that i used to but now my team plays slow and just terrible overall. Players don't react and i'm getting instant sheds from my offensive lineman.
This game is terrible.