Actually do land the A321 heavy you need to reduce the sink rate to 425-430 FPM. Light it can handle 450-487 FPM.
If someone told me at 50' that I need to correct the sink rate to ANY specific number I'd laugh in their face.
People often do a small pitch correction in the 30-50' range. Let's call it a 'pre flare'. If you do it at 50'(typical approach) you do slightly less than you do if you make a change at a lower altitude.
If the sink rate is higher you do slightly more. If the sink rate is less you do slightly less or delay making an inputs.