If you put the two schematics together (TCI and CDI) you canb see the differend output of the opto.
The opto was placed to protect the pic for backslash from the scr.
You can try to remove the opto, the signal from the pic will be the same of the signal out of the opto.
A better idea, take signal from the flashlight for test.
A resistor of 150 Ohm between and the flash-out, from the pin flash-out you have now the same signal.