There were 19 total guesses between ES, the German forum, and here. I'm assuming nobody voted twice.
It looks like I have discovered a way to reduce the amount of net cut-in on a pair of strong glasses. The thickest lens on these pair of glasses is -10.75. The average guess was less than half of that.
Next time a person walks into an optical shop and complains about the cut-in on a pair of glasses, they should make them this pair! Hahaha!