the only difference here is the integrated crown race on the salsa fork.
I suspect that's your problem, and that the integrated crown race in the fork is designed to be used with standard IS52/40 headset bearing or a cup using a standard IS52/40 bearing rather than the proprietary bearings in CK headsets.
I suspect that's your problem, and that the integrated crown race in the fork is designed to be used with standard IS52/40 headset bearing or a cup using a standard IS52/40 bearing rather than the proprietary bearings in CK headsets.