According to the site it is. Revenues -> Eliminate Tax Max without Benefit Credit (parent's #2) closes the gap by 68%. Benefit Formula -> Slow Benefit Growth

According to the site it is. Revenues -> Eliminate Tax Max without Benefit Credit (parent's #2) closes the gap by 68%. Benefit Formula -> Slow Benefit Growth for Top Half of Earners (closest option to parent's #3) closes the gap by 41%. Together these keep the program solvent indefinitely.