“I got the Paul Pang Audio PPA OCXO 10M Master Clock for $575 here on Audiogon.”
I hate to be the one to say this…I looked up the specs of PPA, for a 10MHz clock, -120dBc/Hz at 10Hz offset is not very impressive--especially since the specified performance of the W20SE/MK3-CDT3 OCXO clocks itself is likely better. Not to not mention the variables of external BNC cable and subpar internal cabling/parts in these clocks.
In any case, I recommend buying high quality BNC 75ohms ‘clock’ cables so you can use them with another clock incase you don’t hear any improvements with PPA. Looking forward to your findings with PPA clock. Good luck!