No, mine did not have the extended leading edge mod.  That is also perhaps a good thing to have, but I didn't install it.  It increases the chord and sweep angle of the vertical stab, but increasing the chord doesn't proportionally increase the effectiveness, especially at low angles of attack.  Increasing the sweep angle may delay or prevent a "stall" of the vertical stab, but it makes it less effective at low angles of attack, which are required if the objective is increased stability.  Extending the vertical forward also increases, not decreases the "torque effect" - the turning tendency due to the swirling prop wash.  Adding a fin below the fuselage improves all those characteristics.  Another bit of speculation (as I am not an aerodynamics expert) is that a blade-type delta wing will have a high lift at low angles of attack and will not have an abrupt stall characteristic, although at a drag penalty.  I don't know if having two strakes in a V configuration adds much in the way of pitch stability, as the ES horizontal stab is already large.  Perhaps a single vertical blade-type strake would do just as well with less drag, I don't know.