No taste sacrifice at all as couverture is usually high quality stuff. It's thinner when melted and makes a more delicate coating, that's all. And yes, those numbers are essentially correct and should work for a dark chocolate. I find it's key to stir the chocolate well after you bring the temp back up. Look very carefully beforehand and you can almost see errant streaks of fat crystals throughout the chocolate. Had an instructor who called it purple haze.
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