Roll up a small square of kitchen roll, and pop it down the centre of the coil (with the lid still on the tank). Let the excess juice soak into the paper for about 10-15 seconds, then remove.
Vape again and see how it is from there.
If you put a new coil in, don't prime it, just put it in the tank, fill it, and close the lid. Leave it for 15-30 mins before vaping it. I found if you prime the cotton from the top of the chimney or the inlets on the side, it will over-prime it and you will get a lot of spitback.