I have all my saddles all the way back, also. Same configuration issue.
Ah! Saddle has more then enough relief in the center. The problem with saddles like that is that as the slot becomes wider and longer, the nose of the saddle becomes wider and also has less surface area to support you. Probably works fine for some, but not for me. I need a saddle that's more T shaped, less pear, so a narrower, longer nose and the transition from top to skirt has to be very smooth and round. My current fave is the Selle Italia MAN Gel Flow. Note the very different shape in plan view from yours. I see this saddle on a lot of bikes around here. Seems to fit a wide range of body types. Try ebay for it.
