I have no idea whether the balls were in spec or not...... Maybe the cyclop balls were out of spec.
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If the nine ball is large by the thickness of a piece of notepaper and there is only one gap in the ring of balls around the nine ball, that gap is three times the thickness of notepaper. A similar problem occurs if the nine is too small. It will be impossible to form a tight ring around it and if there is a single gap among those seven balls it will be three times the error in the size of the nine ball.
I think a gap of that size changes how the balls react.
I wonder if the Sardos realized at the time what they were starting.