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Juan, if you disconnect the throttle linkages and the airflow doesn't change, that just means your throttle linkages were set correctly.

I still think the throttle stops are set differently on the right-hand stack. Try removing the stacks with the linkages removed, and use your feeler gauge between the edge of the throttle plate and the stack, at a consistent position (like the 6:00 position, closest to the rear of the car). If you measure a larger gap on the starboard throttle plates, that confirms that the plates have been set more open on that side.

Once the air bleed screws are closed, there's just no other explanation than that the plates are open a different amount, or the throttle bodies are more worn on one side than the other. Unless somebody stuck a smaller gasket between the throttle body and the cylinder head.