I bought a new tfv8 about 2 weeks ago worked great. Then I decided to try out the rba deck also worked fine. Then I swapped out the claptons that came with the rba for some 28g kenthal 7 wrap coils dual build. Worked great for probably 2 more weeks or so. Then I started getting really harsh hits with pains in the back of my throat on the exhale. Mind you I did try charging the cotton multiple times with varying amounts of cotton. Sometimes I take a drag and it's painless but it always comes back in a few hits. So I got fed up and made some new coils same build as the previous and for a few hours after no painful hits. Then it can back. So any insight or advice would be much appreciated. Also If anybody was wondering I'm using the smoke alien 220.