I would say that the blades are at the wrong angle. I would also say that the Bosch blades are junk! If you can find them get a set of Nippon blades. They are labeled NWB. They rock! I have been fooling with a wiper issue on my 06 Grand Vitara. The blades that came on it new were a little streaky ( probably from sitting ) so I threw a set of Bosch blades on. They were ok for about three days and then they started streaking. I then noticed that they were lifting at speed and chattering like hell at speed. Switched to the "new" frameless Bosch blades. I also put a set of the same blades on the 164 the same day. These are even worse than the normal blades. At 25.00 a set they really pissed my off. Changed to the Nippon blades on both cars and they have been perfect for three months now.
The meek shall inherit the rear view mirror.
87 Milano Gold
88 Milano Verde
77 Alfetta sedan
79 Alfetta GTV(smooshed and ground up)