Advanced Pricing Basis Code 8 - Current Net price

Hello,

I'm using a basis code 8 adjustment and a custom function to create a sliding rate adder.  For example, if an item is $10 or less, we'll add $3.00, if its between $10.00, and $20.00 we'll add $5.00 etc... 

The basic functionality is there, and working currently, however I would like to determine my add on amount according to current net price rather than base price. 

As an example, if an item base price is $11.00, but this customer receives special pricing, bringing their price down to $8.00, I would like to consider this < $10 and add $3. 

I do have my adjustment near the bottom of the schedule, so when my adjustment is called, the other pricing adjustments would have already processed.