close it slowly and as it makes contact with the striking plate see if it moves up or what. basically you have the hinges and the striking plate to dork with. don't ask me for any logic on the adjustments as i have never figured it out. i just make one change at a time and analyze the results...and my doors are far from perfect. they will move over time of course too. just found my passenger door is hitting the striker plate all of a sudden and took off all of the paint.
