I don't think there are any that do it for free anymore (unless you are in a relationship with them and it is part of the foreplay). I was VERY lucky to have had my time with those lovely ladies.
It is probably experience that is getting him through it. I like Kabani because she seems to stay on top of her slave a bit longer than most and that is what I am totally into. I have had Amanda sit on my chest for 45 minutes straight as she ate and watched TV (had a bit of a headache after that session *haha*). Mistress Kim on my chest for 30 minutes straight as she read a book and others of lesser reputation for varying lengths of time without a break.
MY wish is that one day I get crushed so bad that I can't move even after the woman gets off of me. Unfortunately, that would take a number of hours to do. Haven't asked anyone about doing this to me because I probably can't afford it and almost no one is willing to take the risk.
I have yet to meet a squasher/crusher who truly does not care about the well being of the person beneath them. If not because they care, because they don't want to end up having to explain an odd situation to the police. The closest one I have seen on film to truly being cruel (even more than Kabani) is Zsalynn. Mind you, she doesn't act like she is trying to be, she just is.
I have videos of her doing butt drops full weight onto a guy on a hard floor and after she lands, just sitting there while the guy grimaces in pain or due to lack of air. I have videos of her where Goddess Patty is telling her to get up off of a guy who is tapping out furiously where you can hear it in Patty's voice that she was more worried about the guy than Zsalynn was. Oh yeah, did I mention that she had someone else hoisted up on to her lap while sitting on the guy? Still she didn't seem to care.
In yet another video, you can physically see where her weight on a guy overwhelms him and she sinks into his chest but she does not let up. Instead, she adjusts her feet to ensure she is sitting properly still and not holding herself up. It's only after the guys chest crushes down a second time and he starts begging her to get up that she starts to move off in disgust. I also saw her stand (for more than two seconds) on a guys chest on a hard floor. Both feet, no hands.
Every time I see those videos, I wish I had the time and money to go and try my luck with her. One of these days ...
All that said, Kabani is still awesome and I'm sure is more popular with everyone than is generally known.
PS Do you post on Youtube with the same name? You post Yokozuna clips?