I've been testing single wicks for my Straight Sided Tumbler (Libbey Jars) for months and months, I'm still at a loss on which single wick performs ideally for this jar!!! The jar is 3.06" in diameter, 3.5" in height, wax weight 8.5oz, volume 12.1oz. I'm using IGI 6006, 8% FO, most FO are purchased from Candle Science and The Flaming Candle. I've tested nearly every size in CD, HTP, and ECO wicks. Lately, I've resorted to testing double wicks. I've been the most satisfied double wicking with ECO 4's. Even melt pool, throw is outstanding, little to no soot, some mushrooming with certain FO, but not all. My concern is the glass gets really hot once it's burned down to about the middle of the jar. I tried wicking down to 2 ECO 2's, but the melt pool was not reaching the sides on the 2nd and 3rd burns. Any suggestions?