Thanks. After I posted, that's exactly what I did and it worked. When I entered my contributions the first time through, TurboTax treated them as pre-tax contributions and my total tax due skyrocketed. But, after I went back and edited, TurboTax treated my contributions as an after-tax deduction. Very unintuitive and poorly-designed but it worked.
Thank you for taking time to reply to my question and a double-thank you for the correct answer! Hopefully it will help others who might encounter the same issue.
