Hi , I have been trying to build (for the first time) a coil for the russian 91% tank , I thought I had done everything correctly , it fires ok plenty of vapour but a weird burnt taste , this is my third attempt , I soaked the tank in boiling water as I thought the taste might be from the manufacturing process but when I rebuilt the burnt taste is back , please help ( oh 8 wraps and sterile cotton if that helps) thanks in advance .