I generally just get it about 90% there and stop, because life's too short for this $#&t.
Heh. This. I roll it a few times and then realise I'm burning through my top tier mats trying to scrape an extra couple of percentage points. Nah. Maybe if I was into competitive PvP where every last MJ of shield counts or where an extra 0.2 DPS could make all the difference. But I'm not. So it doesn't. So I don't.