Hi everyone, I have some interesting updates!
I got this auction that sold a new pair of Valeos with damaged packaging for around 8usd, and I guess they repackaged the blades wrong because they are both 600mm (it's supposed to be 600mm and 500mm for each side).
That aside, I replaced the left Bosch one with one of those Valeos and voilá! No more smudge, no more missed wiper spot, they clean like a charm!
So for now I'll be driving around with mismatched wipers, but they are both wiping flawlessly, so I guess next time I will go with the Valeo ones instead!