Dan,
Yes - the archives show we experienced packet loss in November 2020 and began to discuss it on the reflector. The losses were mostly UDP.
If I understand the issue you describe, any of us can help you test by running tcpdump on our tunl0 interface to determine if we receive 'PTR?' packets thru AMPRGW from your public IP, correct?
tcpdump -vvvn -i tunl0 udp and port 53 and host 44.60.44.3 and host xxx.xxx.xxx.xxx
where xxx.xxx.xxx.xxx == a Public IP
73,
Lynwood
KB3VWG
I have seen various failures in the past.
I have one theory. Some administrators blacklist the 44 space.