Options Not Accounted For When Calculating % Shipping

Running multi-vendor 4.0x and vendors have created products with options that impact the final cost of a product (either add to - or subtract from - total price depending on the variant a customer selects).

When these product are added to a cart, shipping (calculated as a percent of the product cost), does not take into account the options modified price. Cart continues to calculate based on the original, unmodified price of the product.

Bug? Configuration issue?

"Help me Obi-wan, you’re my one and only hope"…

Thanks in advance for any light you can shed on this.