% Discount Tiers

Hi,
I’m trying to configure this to give a discount of 10% if they purchase any 3-5 items (i.e., 1 each of 3-5 products) and 15% if they purchase 6 or more. I just can’t get this to work.

Here’s what I’ve got selected in the rule:

BLUEPRINT
Cart or Catalog: Cart
Deal Type: Package Pricing
Deal Action: Buy Something, Discount the Item
Show Me: Advanced Rule

BUY GROUP
Group Product Filter: Any Product
Group Amount: Buy Unit Quantity: 3-5 [How do I specify a range here for this tier, and then how do I make the next tier be 6 and over?]
Group Amount Applies To: All Products
Min/Max: None
Group Repeat: Apply Rule Once Per Cart

GET GROUP (Discounted Group)
Group Product Filter: Get Group Same as Buy Group
Group Amount: Discount Each Unit
Group Amount Applies to: All Products
Min / Max: None
Group Repeat: None

DISCUONT $
Discount Amount: It won’t allow me to select % Off here; the only available options are Package Price $ or Package Price by Unit Count Pricing, neither of which is appropriate.

Am I missing something?

Thanks!