Wipers that always judder

[Dave200]

I run a 98 ML320 , my issue is the front wipers. They have always juddered when moving across the screen. I have bent the wipers in and out to no real benefit as well as changing the blades.
Could it be the springs in each wiper arm has weakened over the years and not applying eneough pressure for a clean wipe?

Has anyone else suffered from this noisy and annoying trait ??