I did 1/16 on an AGA and regretted it. Like breathing with your mouth open, it was. Try the thing first where you shove a safety pin (anything larger that tapers to a point) in there, and wiggle, push, spin, push, etc
3/64 is ideal (1.2 mm). Lately, I've been doing duals: 2x 1/32. or 1@1/32+1@3/64. I also just did a triple 1/32
More smaller air holes makes for higher air speed (sucking same volume of air
through tighter holes makes the air go faster). This has a more efficient effect on the coil, creating more steam.