I use Peaks Ecosoya Advanced, and I use the 8 oz tins which are 3.13 inches wide and 2 inches tall. Well, I followed the Peaks conversion chart for correct cotton core wicks for that tin size... I started conservatively with the C70, which was much too small. So I've gone up to the C75.... which seems to still be too small! I'm confused, because these are supposed to work up until 3.5 inches wide. But, alas, I can't get my burn pool to get more than 1/2 inch to the edges. Does anyone have any experience with a similar situation? I might go up to c85... the next size up.... but that seems like such a leap. Maybe I'm doing something else wrong? Any help or opinions are greatly appreciated!