I use this on my counterattacking side last season when either of the DML/DMRs are injured or defending the middle is critical. It never conceded many against high Q opposition.
My only suggestion would be changing Pressing Style to Whole Pitch. While it seems counter-intuitive to press the whole pitch while defending, if you take the view that Whole Pitch means running about everywhere the ball is, but I believe that Whole Pitch is not that your players are Forced to press everywhere but rather it removes the restriction of only pressing in 'Own Half'.
Because my experience of 2.5 seasons on Defensive Counter-attacking only is that Whole Pitch works best in effective defensive formations which counterattack.
My only warning would be that you want decent defensive qualities on your MCs because, as you know you are aiming for fast beaking counterattacks from your wide men.
PS. when it works you should get a whole heap of corners.
)
Just 'imo'.