Your lucky, the coils I ordered
SKU 1513300 just give a burnt taste for not wicking properly..
I had to re-wick all of the 5 pack with cotton...
Check that your coils are screwed tightly into the base, but I think that most of these coils are faulty anyway. What E-juice ratio are you putting into them?
The H2 clearomiser is real good if you can find a decent coil to go in it.
Check out youtube and find out how to re-wick them. That's the only way you will find happiness and you will have to experiment a few times to get it right.
I have had the best success and great taste, no wicking problems using Japanese cotton
SKU 1910600 and homemade 1.2 ohm coils operating on a mod. The RG400 also uses these coils.
You will need to one day learn how to re-wick and re-build coils, why not start now?