I'm in the process of doing some physical remodeling. Last October I hit a personal high of 240 lbs. triggering a laundry list of other health issues. Right now I'm down to 195 and planning to drop another 5 - 10. I was 175 for years but have built enough muscle hauling the equivalent of a full field pack everywhere I went that I would start to worry if I dropped much below 185. Sometime while I was building the gut, my butt fell off. I don't know, maybe gluteal atrophy is part of aging but I strongly suspect a combination of too much time sitting in front of a computer along with almost complete of lack exercise targeting this muscle group. I haven't done any loaded squats in over a decade.
It could be that the best and quickest way to fix my problem isn't to buy a better seat, but to rebuild the one I'm wearing.