Hey, SMBMC is working fine with Win10 Pro (both are running v1511) out-of-the-box.
Started a filecopy via Windows Explorer on PC2:
Copyjob from PC1 to PC2 with both NICs connected:

Slightly above 200MB/s.
Copyjob from PC1 to PC2 with only one NIC connected:

Slightly above 100MB/s.
Copyjob from PC1 to PC2 with one NIC disconnected
while copying:

When one NIC gets disconnected the copyjob pauses for about 10-15 seconds, then it resumes and completes.
NICs on PC1:
I would say SMBMC is quite robust. Drivers for the NICs are a complete clusterf***.
On PC2 the dualport NIC is running with Win10 standard drivers (Microsoft Version 9.13.41.3).
On PC1 the 82579V NIC still uses the Windows 7 driver (Intel Version 12.15.31.4), the CT Desktop Adapter is running with the Win10 standard driver (Microsoft Version 12.12.50.6). I'm pretty sure all the options (RSS, Offload etc.) are left at default.
Have you tried using the Win10 standard drivers for your NICs? Or aren't there any included?