Your timing pickup is in the distributor, not on the crank.

You need three things lined up/timed correctly, #1 piston at tdc, rotor pointing at #1 terminal, and pickup at the specified location. Skipping the drive gear one tooth is the same as rotating the distributor. The rotor and pickup are in fixed positions relative to each other.
Relocking the shutter on the shaft is the best way to correct this.