4-5-1v or 4-1-4-1 are similar to counter the narrow diamond. Attack through flanks, all other set to normal, mixed, no arrows, that's enough. Another tactics is forced counter-attack with long passing.
Remember not to swich to another formation if ur opponent scored first. Don't be panic. U must trust in your choice. I've ever won 5-2 with 4-5-1v after my opponent (narrow diamond, same quality) lead 2-0 in first half (I scored a series of 5 goals in 2nd half with no change in formation)