My boyfriend and I recently purchased two iTASTE VTR's along with two samsung ICR 18650 batteries. We are also using the same liquid. Awkwardly enough, my tank is burning my liquid right away. I am only vaping at 9 watts and he has been going up to almost 11. Does anyone know what the cause of this might be? I went back to the shop I purchased from but they had no actual reasoning for me. Thank you in advance for any help!