Open the hood and look at the linkage between the wiper motor and the dash right where the arm comes out of the wiper motor. You will see that each long wiper transmission arm has a pair of studs and nuts facing upward. This is where you adjust. First soak them in penetrating oil and let them sit. You don't want to wring off these studs.
Now, turn the wipers on and let them go full sweep to the top of the strok and turn the key off when they hit the bad spot. Reach in with either a 10MM or 3/8" socket and loosen the nuts a tad, then wiggle the arm until you see the wiper blade where you want it. Tighten it back up and turn the power back on.
If you over do it, the wiper transmission arm could bind up, so just watch what is happening. However, you will be surprised how a tiny amount of adjustment down there will make a big difference how they sweep the glass.
The other thing to watch for is that once adjusted they cant hit together on the upstroke or down stroke. If you adj one you may need to adj the other to keep this from happening. If all else fails the S shape bracket coming off the wiper motor can be bent to increase the two bends in the bracket itself. ( last resort).