Thanks for the reply. We have tried a lot of FO: lime, basil and mandarin, coconut & lime, rhubarb, coffee! None of which have worked. Different % also but mainly 8%. They cure for 3 weeks. The dimensions are: 75mm dia. x 87mm high. I am wondering is it the wax and jar combo. Are the black jars harder to wick because they generate more heat?! The issue is no hot throw and if we do get one it’s very very slight!