additional admin capacity cart changes click cost custom edit example flat item items multiple number ounces page product products rate rates regular repeat screen select seller settings ship shipping submit type view weight working

I have several products, most are flat rate $12 shipping, some are $15. I would like to set up shipping so that each additional item is $6 shipping, no matter which shipping rate is in the beginning. How do I do this?

1. In E-junkie seller admin > Shipping settings, set cost per ounce to ship as 1

2. In E-junkie seller admin > Shipping settings, set ounces of small box to 6 and cost to 0

3. For $12 products: In your products settings, set weight to 6, packaging type to small box and packaging capacity to 1

For $15 products: In your products settings, set weight to 9, packaging type to small box and packaging capacity to 1

This is not working. see this page for an example:
http://s163069307.onlinehome.us/natural-beach-glass.html

I need the first item to be regular shipping cost, and each additional item to be $6 flat

In the event of multiple items, some with $15 shipping, some with $12 shipping, I need first item shipping cost to be the greater of the two.

Example (as on page linked above):
2 Seafoam Flowers
2 Dragonfly

shipping cost $33 (($15x1) + ($6x3))

1) Go to Seller Admin > Cart Shipping Settings;

2) Delete your zipcode, set custom (Domestic & Int'l) rates per oz. at 1.00;

3) Set the cost of a Large Tube at 9.00 and the cost of a Small Tube at 6.00 (both with weights set at 0.00);

4) Click Submit to save changes;

5) Go to Admin > View/Edit Products > Select product w/ $15 first-item shipping > Click Edit > Click Next to reach Shipping Settings screen;

6) Set Packaging Type to Large Tube, Shipping weight to 6.00, and packaging capacity to some absurdly high number like 9999 -- then click Next until you can Submit changes;

7) Repeat steps 5 & 6 for other products w/ $15 first-item shipping;

8) Go to Admin > View/Edit Products > Select product w/ $12 first-item shipping > Click Edit > Click Next to reach Shipping Settings screen;

9) Set Packaging Type to Small Tube, Shipping weight to 6.00, and packaging capacity to some absurdly high number like 9999 -- then click Next until you can Submit changes;

10) Repeat steps 8 & 9 for other products w/ $12 first-item shipping.