I've been tweaking my Hcigar SS Nemesis and found the optimum switch setup (for me). I am using 3 DX magnets, a FT kick1, an 18650 flat top battery, the small "beauty" ring and a 1mm battery magnet on the top of the battery as a spacer.
The gap between the button and tube is about 1.5mm when open, less than .5mm when pressed.
I am using a Protank2 with Aerotank base and the spacer might vary with other battery, atomizer and kick combinations. The switch is firm enough to not misfire with a heavy atomizer, has a short throw and sticks out only enough to allow firing.