Driver side wiper Goes too far to the left.

I had a similar experience, the Drivers side Wiper actually was slapping the forward mounted Mirror .
I tried all the suggested adjustments with little success until I discovered that the Knurled ,Tapered Driver which is on the wiper drive shaft had worn out so was slipping on the shaft.

I was able to rebuild the "Flat side" using JB Weld ,which got Me Home . Then I ordered a few replacement Knurled Drivers from School Bus Parts on Line!

Such a Simple fix for a frustrating problem!

2006 travel supreme. Spartan chasis.

What coach? what brand of wiper?

If the "two arm" Dyna, there are two adjustments. One is on one of the arms where there is a standard screw in a slot that allows you to change the angle of the blade.

The other is to move the spline (have to remove the nut) over a notch.

Check for play in the linkage, it could be worn out.

If it hasn't been bent all you need to do is remove it from the gear just below the windshield and move to a different geared position...

This will make it go lower on the windshield in the other direction position...

It may also be someone has mounted a wiper blade on it that is too long for your model windshield...

Roy Ken