Problem with calculated shipping-priority mail

[abcdee3d]

Gazza,
Sorry to say I think there are real problems with the calculated shipping.I tried to enter in a sampling of zip codes and this is what I got...
p is priority mail and pp is parcel post. I added 1.50 for handling to the usps rates to get the final total for them I used a weight of 8 pounds 8 ounces and package size of 24x12x12.
usps --- ebid
48128 --- 48128
p9.95 --- 12.65
pp9.43 --- 11.74


48895 --- 48895
p9.95 --- 9.95
pp7.63 --- 9.37

63101 --- 63101
p14.25 --- 19.30
pp12.80 --- 19.09

49401 --- 49401
p9.95 --- 9.95
pp9.43 --- 11.74

then I went and changed the weight to 15 pounds to see what would happen and the cost of shipping that ebid calculated was the same as the 8 pounds 8 ounces cost, but it was different for the usps calculations on their site.

I don't know if this helps, but I think the calculated shipping rate still needs work. So now I have 2 listings for butterfly houses that I probably have to delete and though I know it's not costing me much at all, I won't list calculated shipping rate items and can't list large items at a flat shipping rate, because some places really do cost a lot more than others and I don't know how to get this right.
Thanks...Dee