Make sure your landing gear dampers are overhauled every 2500 hours, as they are supposed to be. Ask for the records from the timing check on the landing gear dampers post overhaul. Best if they are within 1/2 a second apart. Do not accept them back if they are more than 1 second apart.
Check the skid extension springs too, they flatten out with age.
Dampers can be a pain in the a
to set up properly, but can make all the difference.