Oh. I dunno. I am not a fan of changing formation if it means playing your weaker players.
If anything, yeah, 3 at the back seems better against 532 since he has no amc nor wingers but I wouldn't put just 2 mc. You are giving him the midfield. Maybe 3132W1? Still think you should play your best players to fit a relatively good formation rather than shoehorn your players into a formation.