Twin Amals when tuned properly (finally) offer great stock performance. Especially for a 50 year old motorcycle. Holding 80 mph is not difficult nor taxing, on the bike I mean.
Cameras and cops certainly can be.
At one time I was really adept at losing any police "presence" believing they could pull me over. These days, if I get busted I just stop and play their game.
The other influence, for me at least is traffic.
Too many ignoroids behind the wheel.
So much more of my ride time these days is accumulated the first couple of hours of sunrise, weekend evenings and holidays.
I also have preferred highways to use for the times when I want to haul around at higher speeds. In my state traffic cameras/monitors are no longer legal as a tool to issue traffic citations.