roasting coil wire

Try measuring the resistance of the ignition cables. I do with an Ohm meter from cap terminals to plug center electrode. That will test for any open, 10K ohms or less is good for me. Also measure coil to cap cable, I assume you changed that.

An open in a wire, creates a hot spot due to spark jumping, as it burns creating a larger gap and goes till it cannot jump further.

Back in the 1972 I designed an built my first cdi ignition, it was a bit hot, and burned up a set of ignition wires. The Ohms of each was greater than 1 megohm.