Been trying them on the top step of a 2 up 2 down lately and really struggling to figure out angles of approach and popping out over the bottom stair to regular, but I'm pretty sure if I can handle them on that then ledges will become easier.
As I continue to try to get these better, I seek out skaters who do them how I want to do em. To me, this guy has some of the best fs tails I've ever seen. I know he takes these to sw crooked and does shit out of them, but it has really helped me to study his shoulders, how he's leaning, front foot/leg movement, and approach angles. Love the tip to put weight on the ball of your foot, I feel like when sliding it helps to have most weight on the instep of your back foot to get that back heelside pinch someone mentioned and really take em for a ride.
Edit: you can clearly see the back heelside wheel pinch in this one. Great study for noseslide technique, too.