Big problems vs 4-1-2-1-2 narrow diamond!!

[Stealthie]

My friend is playing this formation and is quite unbeatable, with 18W 2D 0L in the League for lvl2 and is ranked 1st since the second matchday.
I have played 2x friendly matches with him and went up in a tie in regular time. I am also lvl2, but I won 1x with penalty shoot out and the other time in the extra time with just 1 goal extra. I use the 5-2N-1AMC-2N.
He only lost the Cup match from a tough player and he is still in the CL, but lost the first match. Have to see the return, because it is also a tough player for him.
So basicly in a fair, decent matching player quality you can tie up with the narrow diamond with the v style. I found a site suggesting to use the v style and 4-3-2-1. Similar to v style but DMC is now MC. You can also put down arrow on this MC when the opponent AMC is taking advantage.
See also Top Eleven tactics