RX8Club.com - Failed compression test?

I will give you the numbers. I don't currently have the graph to upload but I am sure it is available. Does anyone know the equation they use to make the compression graph?

March Test
Compression test.
Rotor 1 720,718,717 at 276rpm
rotor 2 778,785,766 at 268 rpm.

July test
Rotor 1 793, 785, 792 at 296 rpm
Rotor 2 792, 791, 794 at 296 rpm

They are claiming since the numbers are greater then 650 its passing and not scaling for the change in rpm. I don't have a high resolution graph, does anyone have a calculator for more exact results?

Also that jump in compressions for rotor 1 seems ridiculous, any ideas on that?

Thanks!!