Ok, I'm retarded. At some point it looks like I changed the UDP port on the problem (main) host. It does like it may have effected the Hello packets as well, as it now shows up on Hello message now, but only after the 2nd attempt initially (and I still get the virtual NICS responding as well, but I can see that they are not the real network address).
So problem resolved as far as getting AV.Mic.On / Off to show up in the log window.
Only issue I see now is that I can't use different UDP ports for both servers - the UDP Broadcast Port setting in VoxWav appears to be global. This causes an issue if I create a Prefix duck to mute/partially mute VOX on AV.Mic.On/Off for both servers.
If I use VoxWav on my Android phone, it will partially mute both servers as the UDB is broadcasted and both servers pick up AV.Mic.On and react to it. WAF factor on my randomly muting her tv show/movie is not approved. For now I have left off prefix ducking on the server in the living room.
*updated XML code on earlier post to replace with AV.Mic.On