Man! I can't tell you what crap luck i have parting. I have a HSS & a carbide cut off. Have it on absolute dead center & half raised it a hair, lowered it a hair. I've tried higher rotation, slower rotation. Thicker oil, thinner oil, nothing does a nice clean job...it's a battle i tells ya. I've watched many a video but something just isn't right. Having a live center helps....a little, but thats not always an option. This approaching from the backside is something i haven't tried, but seems you need your compound to go WAY in to approach from back? No? Pictures/videos anyone?