I make my ejuice and let it steep for maybe a week. I use an ejuice calculator for my recipes. I know I can't be mixing them wrong. Its a 70/30 and I've made 60/40 blends. Just after I put the juice in my tank it will have a burnt taste. Why does this happen.???? I use pg and vg from ecig express flavor west and myfreedomsmokes flavorr. I don't know what I'm doing wrong