NOTE
Thicker shims increase pump stroke and output, Thinner shims decrease pump stroke and output.
So
You were pumping more oil with the biggest stroke 0.55mm, make sure the pin and match mark are aligned when measuring, you should get the marks alignment right before doing the stroke adjustment or at least be sure you are not on the rising slope of the pulley.
You really must get the match mark on the pulley and the guide pin aligned when the throttle is closed. You have cable adjustment where it goes into the pump casing to facilitate this.
It is important to bleed the pump by removing the screw at the top of the pump until all air is expelled, then replace the plug screw.
Then what I do is start the engine and while it is idling I hold open fully the pump pully to allow maximum stroke for around 45 secs, this will purge air from the pump to carb oil line.
The little hole in the pulley is for a spring clip and is a safety feature to prohibit the cable from jumping out of the pulley cable recess