Played 4-5-1v agains 3w-5-2v. Defense, mixed passes.
Did not worked. Eventually oppo nailed my defense with 3 goals.
Although my stats and player ratings were not bad.

Worst rating by my DMC. I would select a tactic with no DMC.

In your situation, and after my 2 matches with this good oppo, I would try to take advantage of his weak defense and score more goals than him.
Risky, but I prefer losing the game with offensive football than sitting back and wait and at the end losing.

Of course every oppo is different, just throwing my opinion