It's not a question of fit with the cut-out. You'll simply notice that you have plenty of room with no pressure on the folds.

The firmness around the cut-out has not been an issue for me either. It's firm, not hard, there is a difference. You'll notice it is flat around the cut-out, which allows you to roll from the hips to lean forward safely.

Some of the more painful cut-outs for me have seemed extra-hard around the opening, harder than the rest of the saddle. I tried Selle Italia gel-flow models that were hard as a rock. It felt like there was a thin, hard rail around the edge of the opening. "There's gel? What gel?" And the shape of the opening was wrong, too skinny, so I always seemed to get pressure on one side of the folds or the other, which hurt like hell. The diamond-shape cut-out has none of these problems. Different strokes for different folks...

Let us know if you go for it & post your experiences!