If you didn't replace your points after you burned out the original coil, you should have. My guess is your points are burned and/or misgapped. The coil doesn't "shut down" when it gets hot, but it can burn out. And bad points can certainly act as you describe.
The resistor (or internal coil resistance) serves two purposes: it limits the short circuit current when the points are closed, and it also helps to damp the oscillations that occur after the points open. Both help to extend point life.
You do not want to add a second resistor to the circuit, as it will cut the current through the coil in half. Since the energy stored in the coil rises to the square of the current, cutting the current in half will reduce spark energy by 75 percent.
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