for some reason when I take a hit it tastes like mental every time I inhale
Do you mean menthol or metal?
If you meant metal, get your temp set to a comfortable level and that taste should go away after about 1/2 the tank of juice is used up.
for properly priming your coil.
There is a method that'll help shorten that metal taste a bit.
Your temp may be just a bit low to get the full flavor out of it since you're only at 388°F
However if that temp is working for you just keep hitting it for a bit and that metal taste will slowly go away.
If you indeed meant menthol, I've got nothing for that unless you put menthol flavored juice in it.