IDK. Its as if a lot of scoots that come from Asian countries just don't seem to fit our bodies - with us generally being heavier and having longer legs? Lots of stories about miserable seats.
Right now I am working on my BET and Win seat. It would give me ass pain in about 20 minutes. Problem is a hump in the plastic seat pan that wouldn't allow me to slide back far enough to be comfortable. I took a jiggle saw and kept cutting out sections of the hump until it was completely removed. Much, much more comfortable. Probably could have kept like that.
Removed the cover and foam, then make a flat metal pan to fill out the hole I made. Took the foam to a guy that does custom auto a bike upholstery. He trimmed the factory foam, added a harder foam where I sit and we have been working on making it fit me. It is about ready to get a cover made.
Interesting that the foam where I sit is a higher density/harder foam than the factory foam. As the seat was leveled out to kill the sloping forward, the foam where I sit is only about 1-1/4 thick. I have ridden hours on it without problem. The nose of the seat was raised a bit with foam that is more like the foam in home upholstery.
Don't make the mistake of thinking that softer foam will be more comfortable. Not true.