I use 6006 wax and in my jars (which are 3.125 in diameter) a zinc 60 and a LX 22 are torches. Maybe it’s because I only use 7% fragrance oil?? I also do my wick testing without any wick trims because I don’t think many people actually trim their wicks. A lot of my fragrances don’t get a complete melt pool until almost half way down the jar, but they do not end up with hang up by the end.
I will tell you that two different suppliers did recommend an LX 21 and a LX 18 for my jar size (again 3.125 in diameter) but with that size wick, I got soot and a container that was way too hot for me.
How hot are your jars after a four hour burn or so?