Sounds to me like you just described ISM saddles.

I like the Typhoon (picture above) or Century. Nice and soft! and a little bit wider than the more popular ISM models.
You lean forward onto the aero bars, pubic rami supported on the front 2 cm or so, everything else either in between or off the front of the saddle "prongs".
Like lots of saddles, doesn't work for everyone, but when riding the aerobars, these are loved by many.
Edited to add the web site: http://www.ismseat.com/index.htm
'09 Trek 7.3 FX hybrid / Jett 155mm
'09 Cervelo P3 TT / looking
'11 Cervelo S3 road / Selle Royal Seta 155mm
Ischial tuberosities: 140mm center to center