I don't see advantage of using 4-5-1v against 4-4-2 as you both use wing attacks but he has 2 ST and you have 1. You need to be strong in defense and quick on the counter, use long balls with defensive mentality. Personally I don't like 4-5-1v but you can use your dmr/mr in the amr role, he'll play just fine, don't worry about it.