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swedeee
I've had a similar problem with the external CL lockrings on Scribe and Fulcrum/Campag wheels with SRAM road rotors. On the Scribes I swapped to the cassette tool internal lockring, as even with an open BB spanner tool like the BBT-9, I couldn't get much purchase, even my LBS struggled.
But try that, a BBT-9 or similar like @amey suggested.