I use the ECO 2 wick in ALL my candles, I work with coconut-soy wax which is creamy and beautiful. I use a single ECO 2 wick in my jelly jars, for my side tumblers I will use two ECO 2 wicks, and for my 3-wick tumbler jars, I will use three wicks. I typically use 10% fragrance oils in the majority of my candles. I will add the fragrance around 180-185 degrees, and stir for about two minutes to allow cohesion. By the time I finish stirring, the temperature has dropped and I will pour the wax into the vessel around 135-140 degrees. I ALWAYS have great glass adhesion, smooth tops, STRONG cold and hot throws, minimal to no soot, a nice even flame, and a long-lasting candle (my candles burn slow but the wick does not clog).
*I have experimented with using a single wick in the side tumbler and the candle still holds all the qualities mentioned above.
I have experimented with using two ECO 2 wicks in a 3-wick tumbler and the candle still holds all the qualities mentioned above.