I was recently told that most electronic CDI are at 28 degrees when first energized. They do not retard to 4 degrees until the engine is flipped or turned with a starter faster than 300 rpm. I asked how fast a good flip was and the comment was that he timed his flip and it was 600 rpm. So, the initial setting should be 28-30 degrees and the CDI takes over from there.

Sorry I can't find the post that addressed this, but it was from one of the highly respected electronic ignition wizards.