A.J.,
Thanks for the long reply, lots of good info in there.
While stunned may be too strong a word, I'm not surprised that I could do this using focus pads on a drill.....I'm just surprised that I did do it. I went into it fully aware (if not as appreciative as I should have been) that heat was the enemy, and that I needed to be very careful. The work was done using relatively short passes of polishing (~5sec), checking for heat on the pad and panel between passes. There's no denying it....I used poor technique and damaged my panel. I don't yet understand if I moved too slow, used inadequate product, used too much pressure, some combination of this, or all of the above. It isn't worth second guessing though, since I won't attempt the same type of work again. From now on, I'll reserve the drill for glass work and headlights, and buy a PC for paint work.
The big picture:
This damage is at the tail end of a 7 foot long scratch that catches three of my panels. I had hoped to save this panel and get the other two repainted. That's not really a legitimate option any longer. So.....I need to figure out how to find the best folks to handle my repair. Unfortunately, I don't know any discriminating customers here locally who could turn me onto an excellent shop. I don't want any part of the vehicle to come back worse than when it went in. Including paint, overspray, trim, or interior (from poor shop cleanliness).