Welcome to TE!

I am also a TT person, although over a much shorter distance than you . On my bike, I use the Fizik Arione and I like it. HOWEVER, it is a bit more rounded on the nose of the saddle, which many claim is pretty uncomfortable. Since my race is so short (9.75 miles), I am usually only on the nose of the saddle anyway. I had DH point the nose slightly lower, and this seems to work for me.

I use the same saddle on my regular racing bike, FWIW, and also find it comfortable there over longer distances.

The issue is that the saddle that works for me might not work for you... There are a few other TT ladies on the forum, so I'm sure that some of them will chime in as well. Good luck!

SheFly