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I agree about less aggressive. If they're original ones, these bits are about 90 years old. What does a few more minutes mean now?
Also, don't allow the metal to get hot or it will distort (stretch). I can only assume the compound I use is available over there (I don't use paper). See if you can get some Lee (or maybe Leigh) compound. It is a stick of abrasive material that is applied to the wheel and it will remove scratches etc like that so long as the metal is capable of taking a good polish.