I also swapped my oem blades with aftermarket bosch wiper blades and get the chattering on occasion. If it starts chattering when it rains, just clean the window and wiper blades with rain-x cleaner so there's a fresh coating on both the blades and windows so it'll wipe nice and smooth.
Or if you're lazy, just spray with wiper fluid when it rains so there's less friction when it the blade wipes the window.
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