Just started vaping 2 days ago and started off well, but I seem to be having and issue with my current tank. Im using an iclear 16 tank and a vv vision spinner battery. About 60% of My draws are perfect, the others burn my throat and choke me up. To my knowledge im not doing anything different between hits. My spinner is set at 4.3v which is what my local dealer reccomended for this juice. Any reason why 1/3 would burn but the others not?