Just looking at where the wicking is coming out on these tanks, these seem to be top coil, not bottom coil. they may be bottom replaceable, but, not bottom coil tanks. More akin to a stardust than anything else.
If you can see the wicks in the tank, you may need to tip the device slightly to ensure they are saturated. If you CANT see the wicks in the tank, or there's just little wicks at the bottom, then it is a bottom coil, and instead of loosening the cap to relieve air pressure, one of the best methods is to take a short hard puff or two on it without holding the button down on your GoGo. This "sucks" some of the liquid over the coil to keep it wet.
This is definitely a wicking issue, and if you're having consistent issues with it, you can try thinning your juice slightly with a DROP (eyedropper drop) of distilled water. This can usually help with thicker juices in finicky tanks.