With all (both) ground wires disconnected, the spark is still so weak I can hardly call it a spark. I got the rotor off by prying a little harder than I really wanted to, and I can see it's been scorched/melted some but it looks like it happened a long time ago. My current plan is to clean and set the points and see if things improve. And, of course, the rotor will have to be replaced before the job's considered finished.
Mark W. in MI