OK, so I ride the same bike (though it's a men's/unisex frame) and I have the EXACT same issues...I found the Arione Donna to be one of the WORST saddles for the problem, unfortunately.

I am patiently waiting for the Ergon SM-3 saddle to become available. In the meantime the best saddle I have found is the Bontrager Affinity. If the Ergon doesn't work I can live with the Bontrager, but I keep feeling like my perfect saddle must still be out there.