Our Price vs Retail Price

I've finally come across a situation where this has become an issue.

When I have a product that comes in multiple configurations and I create a product page with multiple options, the same difference in price between the first option is applied to all the options.

Here is a link to an actual product. In this case it is a rug that comes in 3 sizes. When I set the retail price and sale price everything is good for the 5x8. However, the 8x10 should retail for $1167 and the 9x12 $1587.

I realize when I create the option/variant I can change it from a $ amount to a % and have it come close to the actual MSRP but not identical.

Is there a way to set this manually?

Thank you for your time.