Will the Urth allow you to take the R mount side of the adapter off? If so see what it looks like underneath? I've shimmed a number of adapters with copper tape to get the adapter the proper thickness. Just keep shimming until the infinity setting on the lens is actual infinity.
Edit: I had a Novoflex adapter for my GFX. It was too thin. The 7Artisans Adapter was dead on focused at infinity, the second picture shows the same lens, optically focused at infinity with the Novoflex adapter. The Elmar was optically focused at infinity and the feeler gauges show how off the adapter was. I eventually shimmed the Novoflex to be accurate. If you shim use your widest angle lens to shim it as it is the most sensitive to small position errors.
For L mount I use a $15 Fotasy R to L mount adapter which works fine. Can't recall if I shimmed it or not but can check.
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