I was expecting 50mm to be used on the 100mm test. You measured the cold side right, raw filament. It will extrude a bunch so 1000 kinda seems right on the hot side. Your parts look severely under extruded.
Maybe that one has a .5mm nozzle on it. It should not but give that a try. Change your slicer to .5mm and see if it looks better, that might actually explain the fill not touching the perimeters as well.