Re: Not surprising.
"if you are right on top of the cabinet and have a good new copper phone line, then real limit can still be 80Mb."
The real limit is much higher than that. At my old house I routinely got over 110Mbps actual download speed, and at my current house I still manage over 80Mbps on a good day. 80 might be the highest they're happy to advertise if they can't guarantee better than that, but it's not a fundamental limit on what the kit can actually support.