i find that interesting. here's the flow numbers you provided with a set you did for a customer of mine. they weren't cnc'd ports but these were supposed to be a max port job. i thought it would be worth a look to compare to your new findings.

.100"--82.8/N/A
.200"--157.3/110.4
.300"--217.4/158.0
.400"--262.9/203.6
.450"--286.0/214.6
.500"--304.0/221.9
.550"--318.1/227.1
.600"--322.4/230.5
.650"--332.9/237.4
.700"--334.0/241.2