To identify the same width cylinder you will need to know the previous one`s id.
Second digit can vary +-2 degree from midpoint or x4-x8. Midpoint is x6
Actually this number is high resolution counts, but I guess PCM don`t count that fast at rapid rpm change. Or there are some built in tolerance protection for pcm to through fake code.

By monitoring these cyl id you can identify bad opti signal.