Ed, having gone through some of the same issues, I can answer several of your questions.

As I understand it, no radar means that the EFIS can’t find your N# in the data stream. Most likely because you’re not receiving any adsb in data.

You didn’t mention the device you are using from ADSB. If you have one of the original Dynon 472s, give Dynon support a call. They’ve recently came out with a new version that may fix some of the issues you are experiencing.