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Ha, I would shim but its actually not possible. Once you come to fit it, you realise its an awful design where you have to clear your bars of everything and slide it on from the end - a two part clamp like an out front garmin mount would be so much better.
TL;DR can't shim cos I can't slide it on the tubing.
Pretty sure this another light model, but nicely done.
Fforiwr-
Better option is probably to lose the mount altogether. Looks like the bar mount is bolted on. Undo that and replace with a flattened pipe or piece of sheet metal
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People on here have made little clampy things out of an old film canister that is approximately handlebar diameter. I think maybe @spotter did it?
Edit: @mashton did it also
I would try to bodge something like that onto your rack somehow.
PhilDAS
frankenbike
Multipack coke can shim