I just used the Xicoy to CG my New C130 at a 160in and 76.5 pounds it is not light. I was getting upset as at one point it was telling me to add tail weight, then I reset it all then it wanted me to add nose weight,
I cam to realize this is a tool and any tool not used right will not work as attended. So I took the main wing off, marked the cg, then used a ruler with a plumb bob on it, to help me get an accurate measurement from rear wheels to CG This made all the difference.
Also I added plywood 2'X2' to spread the load for the scale as carpet can mess up the readings.