I am surprised you get reception on McCarrs Road although I did not drive there yet. I wonder if the outdoor aerial makes a big difference. I could swap my analog reception for my indoor aerial and my outdoor one to digital. I think my unit separate the two for whatever reason. I did not install my unit.
I've not been out around Penrith for ages, but I'm sure that when I was there I would have been listening to my DAB+ radio & noticed if there was a problem. I go to Bayview sometimes and get reception all the way along Pittwater Rd & McCarrs Creek Rd. Basically I don't recall having any dropouts in my car unless in a tunnel.
Anyway , overall your unit sounds like a better unit than my one for DAB+ reception. Your screen isn't buggy when looking at the DAB+ text ? Although I don't worry about this as it is a car radio . The only issue with your unit , I would have is no AM. I like to listen to AM still. 2SM sounds bad on digital. Plus I sometimes drive out of town.
Keep us updated, especially if you travel down to Canberra.