Don't give up. I'm on the fourth saddle on my new bike and finally found one I like. I know how frustrating it is to keep taking them back... and then be in pain again. The last one I tried was the butterfly - and the pain from my sitbones was outrageous after an hour. I finally elected something a LITTLE wider - and the difference is amazing. I think I could have shortened my suffering though if I had gone ahead and measured my sitbones. I just didn't want to admit that mine were probably wide, thus giving me the feeling that I was perched on the INSIDES of the tip of those two little bones, slowling filing them to a point... I guess it DOES explain how fast those two huge babies came out...
It's absolutely no fun to ride in pain. I hope you find a solution.