I'm playing around with a Vamo and a 134. On the Vamo, if I go above 3.7v I get the burning taste. On the 134, I can't go over 7 watts and I get the burning taste. I have a 1.8 coil in the Protanks and don't know if I should go to a 1.5 or up to a 2.2 or 2.5. Any advice would be appreciated. If that's just how it is, I'm good with those settings, too