@fthompson251 "I am wondering if anyone has done any testing, experimenting with different clock cables?” - yes, I’ve evaluated bunch of BNC test cable, mostly used for evaluating my chip designs (clocking circuitry). The winner is GORE, pricey low phase noise addition to the signal cables. Typical cost of those is few thousand dollars per cable, matched diff cables are available too. GORE cables helped to improve test setup resolution to femto-second level. You can take a look at BNC options here: https://www.gore.com/products/gore-microwave-rf-assemblies-general-purpose-test-solutions
Oyaide 510 is an excellent digital interconnects cable, why to worry?