In FM15 (the last version I played), I had an invincible tactic 4-2-3-1.
I have been trying to recreate it but without success.
The only tactics I found online are those with 3 strikers and I don't like playing that way.
This tactic though, is how football should be played, "totaalvoetbal" with a higher defensive line, high pressing, wingers, ball playing defenders and goalkeeper,...
Most of all, this tactic really works, I started a new game with Anderlecht, only loaned two players (Cutrone and Renato Sanchez).
Won 12 of my 13 first games, a tie against PSG, did lose 6-0 to Chelsea though.