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In a small shallow dish, add remaining espresso and rum. Dip each ladyfinger into espresso for only 5 seconds. Letting the ladyfingers soak too long will cause them to fall apart. Place the soaked ladyfinger on the bottom of a 13 by 9 inch baking dish, breaking them in half if necessary in order to fit the bottom.
Spread evenly 1/2 of the mascarpone mixture over the ladyfingers. Arrange another layer of soaked ladyfingers and top with remaining mascarpone mixture.
Cover tiramisu with plastic wrap and refrigerate for at least 2 hours, up to 8 hours.
Before serving, sprinkle with chocolate shavings.