Give RainX from @ZAS a go. Transformed the way water behaves on the windscreen. On highway speeds you almost don't need wipers.
After you apply it, the glass feels very smooth, which should help your shuddering problem.
@ZAS also sell the RainX wiper additive which maintains the performance of the original application.
A demo of its performance.
https://www.youtube.com/watch?v=lBeV...e_gdata_player
Windex? Really?
I have the Bosch wipers. They rock too.
Sent from my Huge Samsung Note 2