I have been using the 415 for a few years, with HTP wicks. I have tested in several jars, but like the jars that are 3" across. Some people seem to be able to single wick these without a problem, but I double wick mine. Most of my FO's wick with 2 HTP83 wicks, but some of my FO's take HTP73 and some take a HTP93. Everyone has their own preference and what works for one, doesn't always work for another. But I find about 3-4 % beeswax helps me get nice smooth tops, with this wax.