MacScan has a "trouble ticket" service where they answer questions. I've found them to be very helpful. You might want to request their take on the issues you've raised.
See http://macscan.securemac.com/support/index.php?pg=request

Mac Pro dual Quad-Core Intel Xeons Early 2008; 16GB RAM; MacOS X 10.11.6, iOS 9.3.5