Perhaps you might want to try and look at something local. I had mine re-upholstered at a local shop in my city and they did some custom stitching work too. They added a few layers of some different foam and I am really happy thus far...no sore ass

They dealt with lots of bikes seats, I told them where my bum was hurting and after how long and they gave me a recommendation of what to put in the seat and it has been great thus far! Perhaps you can find a place like that close to your home. The bonus was that I only had to go without a seat for a couple days

Obviously if you order one you won't have any down time, but it's something to think about.