Now granted, my scale does not go below 1g in ability to weigh, but when I weigh 1/4tbs. I get a fluctuation between 1g and 2 grams. So I am gonna call it 1.5g. According to my cure calculator, 454g of meat require 1.13g of cure for 156ppm.
I cure my bacon at 175ppm, and that would be 1.27g.
I think you are safe from things growing out of your neck, but you have to live your life in my opinion. I guess you either trust the FDA or you say maybe they play it way to safe.
Me personally, I cant abide by what The Man says most of the time...