You are probably going to need to look into some kind of traffic shaping and priority settings based on the type of traffic or on the IP address to/from for the audio streams. Essentially a QOS like one might set up for VoIP phones.
After that, can’t help as I don’t have any of these switches.
Do you really need to go through all these hops? Just wondering if you could get the number down by installing larger switches and new cables???