I baught a new set of ego 650 s it is the 650 battery and uses the 510 cartimizer or atomizers/ cartridges I am happy with it for the most part at first when I used a prefilled cartridge and one of my atomizers it was great but got harsh and burned my throat not long later I then filledy cartridge but still had trouble. I read on these forums to put a few drops into the atomizer so I did and it worked great. For about 10 puffs then went harsh and burned my throat again. I have been using it for a few days now. But it seemes like even if it's full I have to put a drop or two into the atomizer every time I want to use it or it will burn my throat even tho my cartridge is very full. I also tried a cartomizer which worked great for the first 15 or 20 puffs but now just burns the heck out of my throat even when I re fill it. I am not talking about throat hit ither in fact I am unable to get a good throat hit because it stings my throat befor I get Enough vapor. I have tried new atomizers and new cartridges but to no avail. It seems that it does not wick properly and I have also tried pulling the wick up in the cart but no real difference. Worst part is my sister baught two and they seem fine with the same juice, Although I haven't tested them much as mine. Just wondering if I can get some advice also would like to know if I would be better off with a tank addon as I might just take to big of hits to satisfy my throat hit. Thanks for the help I looked around the forum for a few days but can't find an answer to my specific problem.