I had my Vari-Tube for about a week now and love it. I am using a vision ego clearomizer Verson 2 2.1 - 2.4 ohm. When i check the ohms of the ego vision on the vari tube it's at 2.3 ohm than the next time i check it it at 2.2 ohm and sometime it at 2.7 or 3.2 ohms. So what is going on here because now it says 2.9 ohms than i took a hit and it went back to 2.2 ohms. I am new to this Variable Voltage thing so can some please explain what's going on here and is this normal ?