Need help setting USPS shipping rates for heavy items (8-15 lbs)

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After setting up my store I see an item I frequently sell, gallons of almond oil which weigh 8 lbs and I always ship using USPS flat rate boxes, either Large flat rate or a B box.

The shipping settings will not show these options and even when I make the gallon 10 lbs in the product admin it still does not change enough, not even close!

Anyone out there shipping heavier items that can help me?