This is my formation when meet 4-3-3 formation, I always win with this formation. (3-0, 5-2, and 3-1)
I hope can help you beat 4-3-3 formation too.

my formation:
----ST(Up)--ST(Up)----
------AMC(Up)------
------MC(Up)-------
DML(Down)--DMC(Down)--DMR(Down)
----DC(Down)--DC(Down)--DC(Down)----

Order:
Mental: Attacking
Focus Passing: Mixed
Pressing style: Own Half
Tackling: Hard
Passing style: Mixed
Marking: Zonal
No Counter attack and No Offside trap

This is Result my formation :
Click image for larger version. 

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Pict. Order:
Click image for larger version. 

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I hope can help you beat 4-3-3 formation.