The drivers side arm may be VERY CAREFULLY bent to allow it to park nearer the bottom and to enhance appearance and correct uneveness. Do it with the wiper blade removed. I used 2 small blocks of wood for protection with a vise grips. Bend a very little at a time and hold the arm so it does not twist on the shaft wrecking the shaft knurling and distorting the arm geometry.The bent arm needs to be on the LH (drivers) side. That sounds like why your arm is going off the windshield. The bent arm will sit higher off the windshield than the factory arm. Sounds like you might not have had the arm tightened down good enough (my assumption). I will go out and take a pic of mine.
The special tool needed is a nail or small drill bit. You will notice there are holes in the arm near the pivot point. Insert nail or bit completely through arm holes after lifting slightly away from glass to release the tension on the arm spring. Then the arm can be removed from the shaft.Can someone explain the steps needed to remove stock wiper blades in order to peform this mod ? I have a stock 1996 impala , and from what I can see there is a nut holding arm in place , after nut is removed the wiper arm seems stuck , very difficult to remove with my hand is there a special tool everyone is using ?