Preface: Been lurking for a while, this is my first post. I'm relatively new to vaping, but have been knee-deep in it since I started (about 3 months ago) and haven't smoked an analog since.
Setup: 650 mAh egoC Twist (keeping it at 3.4v - 3.7v) with Kanger Protank II Mini (1.8 ohm head) and Roar 11mg Truth Serum juice.
I have this issue as well. My Protank II Mini is awesome in most regards but I'm having the loss of flavor after a short period of time. I think some of it does have to do with taste buds getting acquainted with the juice, but there must be some mechanical/electrical component as well. I'm also getting a burnt taste occasionally after vaping for a while. Letting it sit for a while usually helps, but it comes back fairly quickly and I have to change the head (the head is not lasting more than a week, which seems short lived).
One other note re: the Protank II Mini. If no vapor is being produced when firing, it may be that you have to adjust the head. I've found that if I use my finger nails to pull out the very tip of the head where the contact should be between the tank and battery and then screw everything back together, it begins to work again.
Anyone have any other suggestions about the burnt flavor/loss of flavor that hasn't already been listed here?
Thanks!