I got a 510 starter kit a week ago from litecigusa it came with 2 attys. After a week of using the same atty i thought it was time to switch out to the un used one to clean the other one. The new one seems to have much less throat hit and doesnt make the sizzling sound the other one made since day one. I thought it could be the cart so I switched back to the used atty and great th and it sizzles. I did blow out the oil from the new atty before use. Is it possible it is not getting hot enough? There is loads of vapor just no TH. Do attys need to break in some? thanks for any help