If you've already cleaned it, opened the airflow control to fully open and still it is not giving you the right amount of airflow for you, try a chimney build.
I use 28 or twisted 30 gauge wire. I do 7/8 wraps around a 5/64 drill bit to achieve 1.6 ohms. Running it on my Provari Mini, I usually set it to 4 volts, though depending on the juice, I've vaped it as high as 4.5 volts.
View attachment 342141
View attachment 342146
The coil sits about 1mm, directly above the airhole.
When you're wicking, the cotton is a thin strand of cotton wrapped around the coil, like a scarf. The center of the coil should be open, making sure the cotton doesn't block the top of the coil. The ends of the cotton strands loop down to the juice channel blocks, but make sure it's not blocking the juice channel.
If you're using higher VG juice, make the cotton strand even thinner. If it's a higher PG juice, you can use a tad more cotton.
If it gurgles after you've reassembled it, it means flooding. Usually means you have too much or too little cotton.
The airflow improves a bit compared the the traditional horizontal coil.
Hope that helps.