Nice work on difficult subjects!
Some thoughts:
1) In your last version of the first image, there is a purple cast on the blade and the grip also seems to be affected by a color cast.
2) I second the recommendation of more directional light. If you can make the blade look more shiny in addition to getting better detail in the Damascus pattern, that would be awesome.
3) Have you tried some type of hardwood for the background? Or maybe some kind of rock (e.g. slate). Glass could be another possibility. You can put black cloth or paper under a glass pane for a nice effect (but it can be difficult to handle because of unwanted reflections).
4) In your second shot of the knife on the stand, I think that the overall appearance is too blue. It also seems to be affected by a general softness that may be due to diffraction. If you're shooting this at f/22, maybe you need to find a different solution. For this kind of subject where the plane of focus has to at an angle to the sensor, a tilting macro lens or bellows would be ideal, but is quite a bit of an investment. Maybe you can rent one. Maybe stacking is an option? In any case, I think that at this size the image should appear very crisp and not soft. On the other hand, the pattern on the blade is now very impressive.
5) The blade on the stand has a lot of dust on it and also smudges around the logo on the blade.
P.S. I would definitely make the logo bigger and change the logo background to transparent. This white box makes a bit of a cheap impression (sorry if this sounds blunt in a thread on knives
)