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fizzy.bleach
@gfk_velo
Looking at the image of the hanger on your bike, in your image, the material of the hanger doesn't look as if it is actually thick enough, at the point where it is bolted to the inside of the hanger, it's maybe half the thickness it should be.
It's as if this hanger was made for a dropout of similar shape when seen from the "side" but with a shallower recess for the hanger to bolt into. As others have said, maybe a near match, maybe cut to suit, maybe for a later version (or an earlier one) of the same dropout.
The best plan is to contact ZyroFisher, as the current importer of Look - and see if they can source a hanger for you.
BETD or some other third party might also list the correct item.
If you really don't (for whatever reason) want to go down that avenue, you could make a flat plate the right size and with drillings in the right places and asndwich that between the hanger and the inside surface of the dropout to bulk out the inner surface. You'd need longer screws of course. There are risks to this approach- the threaded part that the screws are engaged into will be a long way from the heads of the screws - so they will be a big potential turning moment on them, especially when you are cross-chained. You'd need (at a minimum) to keep a close eye on the tightness of the hanger bolts over time ...
Having said all of that, I know I've built and worked on 595s in the dim and distant past with CA10 and 11 (same spec for smallest sprocket position) and not had a problem that I can recall, so I am pretty sure this is the wrong hanger. It just "looks" wrong (no pun intended), apart from anything else.