I don't know Troy, but Zach Caldwell was pretty good reference in xc, Yes also I'm on "high" heat side. With moving iron at right speed you heat up base and wax for ptex to "accept" wax without damaging ski. I can't tell what this speed is, as it depends on too many factors (from type of wax, to room conditions), but with some experience you cna see it pretty easy if you are moving iron too fast or too slow. I wouldn't really go this far to claim you can't do this with lower temperatures, as just wax dissolving and penetrating ptex worked pretty good at 60-70c hotboxes. But people stopped using hotboxes due other reason, not because wax wouldn't penetrate. Long exposure to heat, even if just 60-70c is not good for skis, and skis lose their flex etc. I'm sure this doesn't show for normal users, but once Olympic gold medal depends on this, you don't want to have ski, that performs worse then it would, if it would be worked on it different way.
Normally my iron temperature is between 120 and 140c depending on wax, and snow conditions for hard waxes (fluoro or non fluoro) and up to 190c for fluoro overlays.