I have found that the open aluminium action levers as shown in your video tend to make slightly more clopping noise than wooden levers. The impact of the closing pallets seem to be transmitted along the lever arms, whereas wooden lever arms seem to deaden the impact noise more.
Also the springs may be set a bit too strong, causing a higher energy impact than necessary to ensure an airtight seal. Your video seems to indicate this might be a possibility. It might be worth trying to ease the springs a little.
If you play with the grille removed, that will also make the pallet noise more audible.
However, as Theo as hinted at, is the pallet noise noticeable under normal playing conditions? I have found that such noise is generally only noticed by the player and rarely by listeners a fathom or so away. Also, goose-neck and grille-mounted mics will tend to pick up pallet noise more readily than stand-mounted mics.
If the pallet facings are really old and compressed, there might be some benefit in replacing them with new soft felt/leather composites, but there will still be some noise.