hate to be different (not really, I'm use to it)...
I have now increased my nic to 24mg and am quite content....
I drip 24 to 36, but I am pretty much a MTL hitter. Mouth is where the taste buds are, :?)
My girl drips 24mg also on mechanical king mod and a agi in dripper mode with a single. .8 ohm coil ...
....even asked the vape store guy if they had 36mg concentrate so she could make it stronger lol wow
While there are a few of us high maintenance/tolerance types, we do seem to be in the minority.
As a pipe smoker I inhaled into me lungs.
That statement right there would have me shunned by most Brothers o' the Briar but it's none the less true.
Matters little now though as I no longer smoke me pipes.
I prefer 1 to 1.9 ohm coils, single builds using either 24mg or 18mg. Mouth to lung more often as not.
But....
...sounds like your build or something isn't working efficiently.
24 mg is unimaginable on my rigs.
User error is not the case in this instance Bad Ninja.

Just because it is "unimaginable" to you and others that a "properly" built dripper would not preclude the use of higher nicotine levels doesn't automatically make it so.
Try to respect that we all be different as to our individual needs and preferences.