I haven't seen your config, and don't know from your description if your selected queuing methodology supports borrowing. Quoting from the Class Based Queing section of the PF User's Guide:
Quote:
A queue may optionally be configured to borrow bandwidth from its parent queue if the parent is being under-utilized.
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That is what I do. If there is bandwidth, I let those that want more get it (they "borrow"), when there is bandwidth contention, they are restricted to their designed caps.