Is narrow diamond effective against 4-4-2?

[tziortz]

I had a cup match against an opponent with basic eleven quality of 29 and mine of 34, i am not used to counter others especially weaker so i was using mu standard 3N-3W-2N-1-1 (which was effective against other 4-4-2) against his 4-4-2 flat. I was winning 1-0 but he turned it to be 3-1, then i changed to narrow diamond and draw 3-3. What do you suggest for the second leg on his stadium. Use narrow diamond again? Thank you. I have 5*+ players for every position except MR and AML (which i dont have any) so please feel free for suggestions. Most of his players are 4* but he has a scout (the lowest level) at MC.