'9' is a standard default mapping in Mame, you don't need to map it.
You need to hold '9' down whilst pressing F2, which will bring up this screen:
Making sure that all figures are at '000' simply press F2 again to take you back into the game then bring up the options menu and highlight 'Analog Controls' and press 'Enter'
Now higlight 'Paddle Sensitivity' and adjust up or down until you find a setting you like
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