If your wipers chatter no matter new blades, your glass should be would becould very well be choppy

https://www.scribd.com/document/1006158274/Premier-27427-Auto-Glass-Mobile-Windshield-Service-On-Site-167856

If your wipers chatter despite new blades, your glass may be uneven. Replacement %%!%%470736ce-1/3-4109-b406-b201146ea44c%%!%% the root motive for modern, silent operation.