I have a 93 Sub and if I am stopped or going less than about 15 mph, the wipers do exactly what they are supposed to. However if I am going more than 15 it leaves a 6 inch swath of water/snow/ice/gunk in its' path (following the exact path of the wiper) making it dangerously impossible to see out of. I have tried about every brand of wiper out there to no avail. I had a mechanic friend tell me to bend the arm a little bit and this would fix it. No difference. It is like the wind pressure is lifting the middle section of the wiper off of the windshield. Any suggestions?