Good news is I finally got the hot end up to 230°C, fast and consistent.
Bad news is that all the fooling around trying to push plastic through it is pushing the brass barrel out of the PTFE (Teflon) rod.
Time to order more parts.
Also: printing with melted plastic makes your apartment smell like melted plastic. And the only window that opens is in the kitchen. A trip to Canadian Tire and a spare case fan and now I have a suspicious duct poking out.