What are those 2 small screws in the deck for? One has a hole through it and the other is solid. Is it adjustable air return to the tank?

I got this because I wanted to see if I can tame it down to 15 watt vaping. Just for fun. I haven't built it yet but I'm thinking 4 SS mesh wicks into the tank and a mountain of cotton in the deck. A single tiny coil directly under one of the air inlets like the Aeolus.

I reduced the airflow by cutting heavy tin foil from a pudding cup lid into a kidney shape and capturing it with the airflow locking ring over the air hole on the right: