I've tried the ISM Adamo, which has lots of cut out. It was ok upto about 120km, but wasn't ideal above that.
I've since swapped to a Sella SMP Pro saddle, which is great.
On the SMP website they have a map with all their dealers, the dealers should have test articles that you can borrow for a few hundred km to see if it works for you, and swap around in the range to find one that works. Tho I don't know if they are all as tolerant as the place I got mine from, I did over 4000km on the test article before swapping it for the sale unit.
J