Tire Pressure - The Squeeze Method

On a recent fatbike run with 15 of my fatbike breathern I realised shortly after starting the run that there was to much air in the tires. 

I did not use my gauge, but did the “squeeze test”. I guessed I had about 3lbs per tire . . . I started with 5lbs. Others aired down while some did not. 

The traction and steering increased dramatically. I checked the pressure when I got home . . . I think I need to re-calibrate my squeezer.