My guess is that what you are seeing is the play in the shaft, (up and down). I usually set the end play to .008-.010. I believe the factory spec allows up to .019 and I have seen them at over .030.
I keep a selection of washers that fit the shaft but are not larger than the gear hub for adjusting the end play.
When the shaft has too much end play it can change your timing as the gears are curved.
Jim
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