cutting deeper won't make it any different. It will just put you at more risk for infection and other yuckies, when you finally come out of your SI storm. Don't cut deeper...don't do it at all if you can help it.
Sometimes we can't go deep enough to make anything feel better because it just doesn't work, and it won't work. It can seem like a little deeper, a little more, but it's like a hunger you CAN'T fill, you know what i mean? It's not like a thing where you can just cut yourself all up and finally feel relief. It won't happen.

((((hugs))))