Actually, we ended up using both at one point. We started by using the dedicated 10-pin port on the top, then we switched to the port that's on the custom expansion port in the middle.
I'm not familiar with sending bytes in labview. However, I know in java it was just a
single initialization parameter to say which SPI port to use. Everything else was the same.
Also as indicated in this thread, we did have to chunk the send data into
128-length bytes to get it to work nicely.