What exactly is unbalanced? The only formation that is balanced the most is the 4-1-2-2-1 asymmetric
----ST
Aml----AMC
---mc-------mr
------DMC
4 def
This formation has players in every position horizontal and vertical, but unless you possess a star studded squad you can't play it.

Most of us should play through middle or through the wings. The weaker your squad is, the more simple your formation should be.
To beat the narrow diamond, understand that the AMC should be stopped as he usually is the classic #10 player who can create and score. use 3DC and 2 aml/amr with red arrows to push back the opponents fullbacks to cut off the opponents midfield support. the rest is up to you depending on your supply of players.