Here you have a Screenshot. I started your application with opened Flipstand, after 60 seconds I began to move the Device around for about 20 seconds (hold it vertical for 5 seconds) and the rest of the time it layed flat on the table.

I know, you don't belive me. And your source seems also very fine to me.

It works proper on other applications. At example AccDisplay. So I guess the problem is the smoothing algorithm. It seems to me there is no smoothing working at my device. The Diagramm looks very noisy to me. (if I had it flat on the ground, why are there such periodic sparks?)