The Intel driver gives you 32 mbps and the Windows driver gives you 35 mbps, is this correct?
How many times have you run that test? Did you get the same result each time you ran the test?
Which is the test that you are running?
Running the upload/download speed test from the following site: www.broadbandspeedchecker.co.uk
As an aside does not see all available wireless networks:
Edimax Wireless stick sees: 6 Wireless networks in range
Intel wireless only sees 2. The top two in the image below
There is a new driver version available, please give it a try Download Intel® PROSet/Wireless Software for Windows® 10.
Did you change any settings on the Network adapter tab in Device Manager?
Please, check if the antennas are well seated inside the NUC, I would also recommend checking this information TechNote: Access Point Interoperability Issue with uAPSD.