Hi! So I've been using my Dayan Zhanchi (my only cube

), and I've found that my "M" layer doesn't seem to turn very smoothly. I feel like it requires more force to turn than the other moves, and often the M2 double trigger doesn't turn all the way and the cube catches. However, I found that when I loosen the tensions, it works fine, but at that tension it is extremely prone to popping. Also, when I watched a lubing tutorial, my core seemed to have more friction and didn't turn as smoothly and seem to spin forever when you hold it by one center piece and flick the others. Is my problem with tensioning, lubing, or both? Thanks!