One way to solve the problem is to pull the wiper arm off the pivot and rotate it a few degrees and then push it back on. The wiper arm is pushed onto a conical sleeve that has a lot of fine splines on it. By pulling the arm off and rotating slightly in the opposite direction you can position the arm where you want it. Might take a few tries but it's not difficult to do, with one caveat
Take a look at the photo on this page
and on the right end of the arm you'll see where the shaft sticks into the arm. Your arm likely doesn't like this but hopefully you'll get the idea.
Sometimes it can be difficult to pull the arm off the shaft initially so take care not to damage anything. You might need a small puller to get it off. In my case I had a cheap battery terminal puller that I used and it worked fine.