I have the same problem albeit on the passenger side and my IS is 11 years old! Lol...
But still I tried OEM from Lexus, Halfords, Bosch and umpteen other makes. Been through 7 sets in 6 months! They all work brilliant for a day or two, in the case of the OEM ones a week! Then they start to judder and the passenger side doesn't clear on the down swipe! I've tried everything, windscreen cleaners, polishers the lot! Had them looked at to see if the arms were bent while I was at Lexus Bristol getting a new key and they said they were fine!
Can't fix it and I've given up! So if you find a solution please let us know.
All I want is for them to clear the windscreen as well as the wipers on my dads Alfa do!!