Tomato QoS lowest priority 100% when not used

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http://serverfault.com – I'm setting Tomatos QoS and i'm seeing that if i limit my inbound for lowest priority it will stay limited even if whole bandwidth is not used. For example: I limited my torrent class to 40%. I can download with my torrents only 40% of my download speed. How can I get 100% when my line is not used? (HowTos)