I've got a 155mm Bontrager Affinity you can try out. It's got a dip rather than a cut-out, which I need on my new bike, largely because my position is now more similar to yours, with the pelvis tilted forward. It's this one: http://www.evanscycles.com/products/bontrager/inform-affinity-rl-womens-saddle-ec026379#features
It's not very padded, but has that kind of hard foamy stuff on it so it's not really unpadded either. I haven't tested it on a ride of any significant length, you're welcome to borrow it before you go to Dedham if you want.
@bothwell started
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I've got a 155mm Bontrager Affinity you can try out. It's got a dip rather than a cut-out, which I need on my new bike, largely because my position is now more similar to yours, with the pelvis tilted forward. It's this one: http://www.evanscycles.com/products/bontrager/inform-affinity-rl-womens-saddle-ec026379#features
It's not very padded, but has that kind of hard foamy stuff on it so it's not really unpadded either. I haven't tested it on a ride of any significant length, you're welcome to borrow it before you go to Dedham if you want.