Flatten metal surface settings

I am trying to flatten a metal surface which I can do using Smash or Squish. It seems like Squish is the way to go but need some suggestions for what settings to use to get something relatively precise. Or is Smash better? Need to create a decal that goes onto this surface and somewhat close to the edge. Thank you!

Metal surface flatten 2.3dm (3.0 MB)

Squish - add decal - SquishBack
Options Free and Floppy material seem to give acceptable results.

Max.

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