My ass still gets sore some but it is a lot better than what it was. I was talking to a young man that is a mountain bike endurance racer. I am not sure of the exact format of the races but just from the description of the type riding, it sounds a little extreme for me.
Anyway, I was talking with him and another very good road and mountain bike rider from the local bike shop in my town about saddles and my ass getting sore. My local guy told me that he gets people in complaining a lot early on and said it is a bicycle seat, not a sofa, you have to work up to being more comfortable and it will never be like laying on the sofa or riding in a large cushioned car seat. He was not being rude to me or talking bad about anyone else we were just having a normal conversation.
The other mountain bike endurance racing guy also worked at a bike shop but in the metro area north of me. We were discussing saddles and soreness as well and what he told me was that a lot of the discomfort comes from your ass muscles getting tired and not supporting you later in the ride like they do in the early part, they just lose strength and don't hold you off the saddle. With this in mind I started doing a lot more riding out of the saddle to try and build up my ass muscles more (I don't know the exact name of the muscles, sorry for the crude description of the muscles). I think it has helped me doing a lot more standing while I ride. It helps build the muscles and allows you to stretch your back. I will get out of the saddle on the flats, going up small rises, hills, I will even get out of the saddle going down hills. Going up hills I often times shift to a higher gear now and stand and attack until I get tired. Be careful trying that at first, drivetrains don't really like that sometimes. I have bent my chain a little a couple of times doing that, I am now seeing the value of higher spec group sets. Hopefully I will get better at shifting too.
Another thing I noticed is the pro road racers, they cover a lot of miles and they spend a fair amount of time out of the saddle. I still get sore but nothing like I did before since working on strengthening my butt muscles and spending more time out of the saddle.