@wsrrsw,
Glad to hear it‘s working. Although it sounds like overkill, I use an Ethernet isolator (EMO EN70-HD) directly at the streamer for good effect (l.e. after the Etherregen‘s moat) Don‘t know why but it works a treat. If you want to go further in overkill tape 2 AAA Bateeries parallel to the cable into the streamer with the + pole pointing to the streamer. (again, don‘t ask me why, but it works)
I also highly recommend an Intona Isolator on the USB connection.
Digital transmission is anything but sorted and mature. It takes lots and trial and error.