I've left mine unsanded, air holes are at a 45° angle from the coil.
I had tried it a tiny bit unscrewed to try direct airflow. I could tell a difference, but not enough to bother with, and some builds I've tried have done better with all four air holes.
I had tried it a tiny bit unscrewed to try direct airflow. I could tell a difference, but not enough to bother with, and some builds I've tried have done better with all four air holes.