Apologies, let me correct one of the values quoted in my earlier reply.
A hard landing is defined as:
- a landing with Nz of more than 2g at the CG, not 1.6g
An overweight landing is defined as a landing at more than the MLW with Nz of more than 1.6g, or a landing at more than the MLW with Nz of more than 6 ft/s.