How can I keep the front door from blowing open?
If the latch plate is flush with the door edge, the set back is correct.  The flat back (faces street for out swinging doors) must be able to extend into the strike plate to hold door.  Many alignment issues crop up to pull those 2 edges apart.
Door gaps tell what has happened to its alignment over time.


up/down misalign due to top hinge pulling away from jamb.  This will rotate the door down (the door will have a wider gap at the top hinge side), lowering the strike in relation to the strike plate, AND make the door hit the opposite jamb.  Sometimes a long screw(3") in the center hole of the top hinge (in a 4 hole hinge, its the 2 inboard holes) can  pull the door back. Sometimes this treatment is necessary for the middle hinge also (if there are 3 hinges)
The strike plate can be filed some amount if the misalign is small (and the hinges are otherwise tight to the jamb). 
The strike plate can be moved, but this gets complicated, as the recess has to move with it.  If this is necessary, cutting out and putting in a "dutchman repair", (illustrated below) may be necessary.