I got my first 2 1.5 ml Vision Extremes a couple weeks ago and after a week of vaping one, I was very impressed. I proceeded to order 1/2 dozen of the 2.5 ml size and the first one I filled just doesn't taste right. I've gone thru close to a ml and it's just not getting any better. Could there be a problem with the Extreme? I don't know what else it could be. Anyone have any ideas?