I've had a lot of good success putting women who like cut-outs on the Sella Italia Lady Gel Flow you mentioned. If the problem is mostly soft tissue pinching/smooshing/chafing and not that much pressure on the pubic bone itself, this could be a good place to start.

And as Muirenn mentioned, a saddle that is flatter across it's widest point and/or a little wider overall may work better for you.