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@jsabine
Hurrah for the beer can shim! (I think it's Zen and the Art of Motorcycle Maintenance that points out beer cans are nearly ideal shim material, especially for clamped interfaces - thin, consistent thickness, easy to cut to size, deformable, and ready-protected from corrosion. But if you have a BMW or a Harley, you won't want such common-as-muck bodging contaminating your precious vehicle, so you'll insist on paying for a specialist branded shim ...)
More to the point, I'd keep an eye on the crown race for movement. There's no clamping force on the shim, and the race/crown is meant to be an interference fit - I doubt that the interface is quite as solid as it actually feels.
(I had in mind that cans were about 0.1mm thick - Wikipedia says 80 microns, so 0.08mm. Assuming you got two complete shims in there, you've filled between 0.36 and 0.4mm of the gap: looking back at the Sheldon link, I'd guess this is a JIS or old Italian race at 27.0mm on an ISO fork which wants a 26.4mm race, so a 0.6mm difference. You'd barely feel a 0.2mm gap, but if there's any looseness at all things might wear a bit oddly.)