This crumble I have slides off my 3.7 kiss carts on my omicron. Used a 7.4 kiss for the first time on the core at 7 like someone recommended in a post and it OBLITERATED the crumble. After the first hit the crumble was completely gone and the ceramic bowl was spotless. A little hard on my throat, but that thing is amazing.
I did my usual 3 second on, 3 off, 3 on that I do on 3.7 carts, is that too long? I read in another post you need to pulse for less than a second at a time to help keep the 7.4's alive and well. Also since trying out the 3 second on-off-on hits and using a globe to show me how slowly to breath I am much happier with my kiss carts. I melt the wax on just a little first too, just not enough to let it run down into the holes though.