Thanks for the update. The thing is, the USPS rate calculation works great for most products, but I have 4 that I can do Large Flat Rate Boxes, so, I dont want to disable the USPS rate calculation.
Heres what I think I have figured out to set Flat Rates for some products............
1. Created a price for the "Box Large" category, at $12.95 (Which is the USPS Large Flat Rate Box charge)
2. Place a "0" in the Ounces categor.
3. When I set up the shipping options that required the USPS Flat Rate Box, I put a "1" in the Weight Table, Packaging Type "Box Large", and Packaging Capacity 100
It seems like it working, although its aroudn $0.50 higher than what it should be, but this is ok.
If you think I'm doing something wrong, please let me know......