Multimatch : keywords which occur several times

Hi,
I'm using a multimatch query on 10 fields with Type.MOST_FIELDS.
Most of the fields are short (product name, main category, secondary categories, brand, seller,...)
but two of them are long (description, technical characteristics) and may contain each searched keyword several times. When this happens, their scores are too high compared with those of the other fields.
Is there a way to reduce the score of these two fields when they contain each searched keyword several times otherwise than by decreasing their boost parameter ?

Thanks

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