I would say, if you play normal or defense, you wouldnt be able to get much opportunitys to score. Attacking Mentality will get you more posession and thats what you need against a stronger opponent.
You stop his AML/AMR with your DMR/DML. If you use blue arrows on your DC's , his attacking is almost stopped completely.
I often let my AMC play as a ST when i change my formation and he does great,so dont worry.
He plays 4-5-1 V, so your AMC gets disabled by his DMC. He wont get much chances to score. So its useless to let him play on AMC.
Switch him to ST if you want him to score.
I hope you'll win that **** !
P.S:
Im playing in CL Semi Finals against a stronger opponent too, and i use the same system i recommended you now.
easy 3 steps:
Disable his attackers,
focus passing into free spaces
watch his formation to make sure YOUR attackers wont get disabled.
And it will sure be a balanced match!