So I recently replaced my oe wiper blades with Bosch icons and now I notice that when it rains the left (driver's side wiper) doesn't wipe smoothly across the windshield. The left most part sort of shudders across which is not only annoying but not very effective. I am also concerned that it is putting unnecessary stress on the wiper motor. I'm suspicious of this being caused by the fact that the wiper blade guides http://www.realoem.com/bmw/enUS/showparts?id=ET37-USA-01-2005-E46-BMW-325i&diagId=61_1065 (number 9 in diagram) must be removed for icons and other 'modular' wiper blades to be fitted. I believe that the issue is only present on the left side because of the added length compared to the right. Any ideas on what else might be the cause? I can't recall reading a bad review of Bosch icons so this one really has me stumped.