This test model is designed to weigh exactly 10 grams when printed in solid PLA (volume of 8000 mm^3). Due to nozzle diameter, slicer settings and many other factors the estimated and printed weight might not be exactly 10 grams but you can tune your flow ratio and density to match either the slicer estimated weight or 10 grams.
FlowRatio *= EstimatedWeight / MeasuredWeight
FlowRatio = 1.00 * 9.89 / 9.48
FlowRatio = 1.0432
Density *= MeasuredWeight / EstimatedWeight
Density = 1.25 * 9.48 / 9.89
Density = 1.1982
This is an ongoing experiment so any feedback is greatly appreciated. Thanks!