There's a lot of different ways to look at uneasy listening. Most disturbing was probably that song on bird seed with the stories from the sex workers. I'm not into edgy or transgressive art so that was a bit much for me but I get the point they are making.
Sound wise I think borbetomagus is probably the hardest listen I've experienced. The high pitched noises are pretty intense. I would also say masonna is up there. I used to really like it but I don't really relisten to him much. I mean there a noisy playlist spotify made for me and he pops up once and a while and its dope but essentially that's plenty masonna. Once in a while he definitely hits.
As far as intense sound goes I think the Tinnitustimulus album on AAD was pretty powerful
https://abhorrentafterdeath.bandcamp.co ... scha-muche. Honestly one of my all time top noise albums. I'd probably put it on if I was in the car with someone and they were being annoying and saying that 100 geks is noise or something to ruin their day.