Here is a firmware with a setting for the coarse gain. https://drive.google.com/file/d/1cUGuJSTHoOrThnycG4vg197bmirrQZIi/view?usp=sharing
The setting is called Analog gain for now and range is 0.5-2.0 like in the datasheet. It defaults to 1.3 like it was. A setting like this is called ADC Level on the Framemeister and maybe that is a better name?