Anthrope, one word of thought. Is the coil and the series resistor matched with the points? I had a problem with a miss in my 280SL after I self tuned-up the SL with new Bosch/MB points, condenser, coil, resistor, and sparkplug wires. As I found out later, I had not matched the resistor ohms to the coil nor did I match the points to the coil. during the production run of the W113, several coils and resistors were used at different ohms from 0.4, 0.6, 0.9, &1.8 ohms. Also noted, different distributors were used. Now once I got the correct points for the correct resistor ( mine is a 1.8 ohm) and matched the correct coil (the red label for 1.8 ohm resistor), it has been running, as Roger put it, like a new Honda (supersmooth idel, etc). Worth a check in your case.
Robert Hyatt
Williamsburg, VA.
1970 280SL, Red on Silver,4-speed, Euro spec; 1999 C230 Kompresser Sport, Black on Black; 1990 Miata, Black on Red, 5 Speed