When running on a Win10 machine I do get about 100Gh higher but the second I use the machine for anything else it drops back by quite a bit.  I like running them off the Raspberry even if it is a little slower.  The Pi's work well and use less power.  With the great GS hub it makes everything very streamlined.  I did just pickup a Pi "HAT" that has a hardwired network connection that may help (though I think it is still on the USB bus so it may not make any difference).  The HAT is called a "MakerSpot 5-Port Stackable USB Docking Hub" and has USB and a network connection.  There are lots of similar Pi add-ons that might help like this one with USB and network connections.  Of course the Pi Zero's are so cheap it was worth the experiment ($5 if you happen to be near a Micro Center in the US).

Anyway, a few hundred Gh for such a lower amount of power seems worth it to me.  With that said I do get the desire to squeeze as many hash as possible out of these little boxes!