I searched the threads and couldn't seem to find a solution to this specific problem...

I have a product with a base price of 0.40, with 2 attributes:
4x6 print set at +0.00 (40 cents ea.)
5x7 print set at +0.80 ($1.20 ea)

At this point everything works.

I then want to give a quantity discount of 15 cents off for 100 or more prints.

When I do this, a couple weird things happen:
The second attribute gets reduced to 80 cents instead of 1.20 for quantities under 100.
The first attribute does not apply the discount for quantities 100+.
The second attribute does get the discount applied, but as you might guess, it's 65 cents per print.

Please help