Modifiers - Rounding Problem with multiple modifiers

Hi all,

I have an Item with List Price 4,62 Euro

Rounding is setup -2 in the List price so I am working with 2 decimal points.

I also have 

Modifier-1  with 2% discount, that means 0,0924 = 0,09 (2 decimal)

Modifier-2 with 28% discount that means 1,2936 = 1,29 (2 decimal)

So the Unit Price is 4,62 - 0,09 - 1,29 = 3,24 based on the setup I described.

My problem is that because the Discount analysis is not something we want to make publicly available, we only want the customer to know that he has a 30% discount (2+28)

So the customer expects a discount of 1,386 = 1,39 (2 decimal)

So the Unit Price should be 4,62 - 1,39 = 3,23.

What can I do to Fix my Unit Price to be 3,23 and keep Modifiers 1 & 2 so that I can track what Discounts we are giving?