Your comments

In reference to point #4 above. Wouldn't grounding the laptop AND ethernet cause the laptop to complete a ground loop? Or would this only be the case if you were not using the ultimate USB to ethernet adapter? Or is it possible to have to do with the material of the laptop(mac vs pc)?

For example,  I'm curious if you can ground the laptop at the laptop and also grounded the ethernet at the mac laptop without having a ground loop. Keep in mind that the line is isolated from the switch already.