In general, what I look for during test burns is: 1. Is this the right size wick for this wax, container combo? 2. How well does this scent throw? 3. Safety? Does it get too hot? Is the flame too high? 4. Smoking, soot or mushrooming? 5. How quickly does it burn? I have to retest everytime something changes such as size, new FO etc. Everyone has different things that they want from their candles. I would find out what wicks you are using and the size so that you have a jumping off point.