Shipping rates incorrect - PLEASE HELP!!!!

[Stormshade]

I'm soooooo close to opening shop but have to get the shipping in order. It's not calculating the correct shipping prices and I have to figure out why.
I have the book but I've stuck right here. Is there another resource someone can direct me to that has a step by step on how to configure this shipping.

Basically I need per unit (based on weight) shipping prices (true USPS postal rates). I need to be able to handle orders from anywhere. I know for sure lots of domestic and international being mostly Europe, S. America, Japan.
I do have a webtools account that is responding and calculating a weight. Problem is I'm getting wrong prices, for instance 1.40 shipping instead of what the USPS rates calculator is giving me which is .98.
I did check the tare weight (used to show $3 until I fixed that part!).

Should I be setting up Zone rates? How do I get those rates and ISO codes to plug in? I would think there would be a more automatic way of adding in all the zones. I'm picturing myself having to add in every zone in the world! I'm sure that's not what I have to do. Please tell me it isn't!

Any help would be greatly appreciated.
I"M SO CLOSE TO OPENING!!!!!!! People are waiting. lol
It's driving me crazy that I can't get this.
Please please help steer me in the right direction to find this info.