So I just got my DMT Aligner with diamond stones for Christmas, and I've been trying it out on my SOG Trident, which was already pretty dull, so I used the coarse stone. I wached the youtube video by DMT, and I did exactly what the guy in the video did. My edge is getting duller. I have been pushing very lightly, and I have even put sharpie on the edge to see what I'm taking off. It looks like I'm barely taking off anything. What am I doing wrong?