Looking to make quantity disc for postcards

Hi

I have been looking over the boards for months on this topic ..
here is what I would like to do ..

The items have several things to them:

1. pictures that range from 9.99 to 29.99
   those I am able to do ok

2. I would like to sell post cards 1 for 1.50 and 10 for 7.50 thought I go to the attributes and set up that way and no luck once the item is in the cart .. it keeps showing no discount on the 10 ..

right now I have set up where if you buy 2-5 the price is -50 off and for a box of 10 or 10 pictures I would like a -1.00 off

not sure why this is not working

I have taken out the discount add-on and the cross share as well .. as that seems to interfere ..

the site is http://dezertdezinez.com/store

if you need a sign in or something to see what's going on please let me know .. I need to get this working asap

thank you