Hi, welcome. I’m not sure I follow your math, but these values are unitless (counts) and must be deconvolved from the instrument response prior to converting to g or Gal. The SHZ channel can be converted directly to acceleration in m/s2 by adapting the code in the following post:
From there, you can multiply the data array (stream.data) by 10 to get Gal or divide by 9.8 m/s2 to get g.