If you're getting a fairly decent CC decode then it stands to reason the service channels should as well. Are there any service (voice) channels on the distant site that my fall outside of the bandwidth of whatever preselector you're using? You might try bypassing the preselector and provided
that it's not needed to prevent some local signals from overloading your SDR.
If bypassing the preselector isn't helpful, then I have means to analyze the composite IQ signal that can be captured as an .IQ file using the
(R) record function available from FMP24/FMPA/FMPP. Note, this has to be an IQ capture and not a wav format file that's typically done from
DSDPLus FL.
The .IQ dumps are quite large and grow quickly in size the longer your record making it necessary to post the file(s) via a cloud drive
service that can be shared with others.