All above post are great one thing also is airflow via the coil heads bottom pin hole size connector.
My experience with the bottom connector pins airhole as show in picture can also effect throat hit.
For instance i use the joyetech mega v2 tank with a 1.00ohm clr coil with 12mg nic and 94%pg 6%vg
the pin on the clr 1.00 ohm connector is very small and i get a nice satisfying throat hit.
I also have some .5 ohm clr coil heads and removed the pin (there interchangable) which has a larger diameter hole in bottom of pin and my throat hit diminshed to point where is was too light.
So i put the smaller 1ohm pin back into the bottom of clr.
I also use the wismec amor plus tank which takes a rebuildable coil and make 1.00 ohm coils, the bottom of the pin hole is even larger at least twice as large as the clr .5 0hm pin and the throat hit is very poor to point where for my personal vape is what i call airy.
Shown are 2 pins clr on left and wismec amor plus on right.
The big airhole in pin on right greatly diminished throat hit.
Even adjusting the afc(air control flow) more restricted on the tank had a negative effect as it made the vape rather harsh tasting , there was no adjusting it to point of satisfaction.
What i did then was take the 1 ohm clr pin and its silicone gasket and it fits perfect into the wismec amor plus coil head along with its original gasket and the throat hit was back to my satisfaction.
Here is wismec coil head outfitted with clr pin and gasket with original pin removed works great now.
Shown is wismec and clr coil heads.