I always fly .83 or less, descend at 290 and go 250 below 10,000 unless directed by ATC or Vcl dictate otherwise.
I watched ol' Klepto do .85 on a redispatch once. Burned up half of our "pad." I said something about it and he said, "I get bravo zulus for going fast...."
Please...keep the hammer down and forget about it.
This is why the windshields are heated.
That radome ain't, nor is the skin (again, see above).
Do what you want, but somebody's going to kill a crewmember someday "keeping your speed up" for ATC. And you as PIC get to take the blame. All of it.