so it's a dual coil
you sure it is Very Tight in the base ?
can you see the wicks (or enclosed ?)
if the tank can't maintain a vacuum, juice will run right thru and out the coil (onto batt)
or you can add bit of cotton on top of coils
so it worked OK for awhile, now it leaks
all silicone O-rings still in place ?
good luck , let us know...