I would like to check some information in regard to your Intel® NUC Kit, so in order to gather that information use the Intel® System Support Utility. Find the application here; Download Intel® System Support Utility, once done attach the file. To attach a file, you must click "Use Advanced Editor" in the top right corner of the response box, then the "attach" option will appear in the bottom right corner of the response box.
In regard to your VSynch question, this feature can be set to Always On or Use Application Settings. Use Application Settings sets VSynch under control of the game or application that uses it, so it will be running when the game or application needs it.
Check more information in regard to VSynch here ; Enabling and Disabling Vertical Synchronization
Can I send the SSU result .xml to you privately?
How do I set Vsynch Always On? It doesn't matter whether I "Select Application" or not, the Vertical Sync selection is "Use Appliaction Default Settings" or "Use Driver Settings". There is no "Always On".
For the "Enabling and Disabling Vertical Synchronization" page: I don't know how that link helps as I'm already trying all options in "Intel HD Graphics Control Panel". The web page shows "Vertical Sync / On" option. But I don't have that option. Instead I have "Use Driver Settings". Which is fairly confusing as Intel HD Graphics Control Panel IS the driver settings, right? Also, if I add MPC-HC into the "Select Application" box (with Browse), it appears there. But I can't press Delete at the bottom bar. Then, if I exit Indel HD Graphics Control Panel and reopen it, MPC-HC has disappeared. Basically, not very much make a lot of sense.
You could try something like this; How To Password Protect ANY File in Google Drive - YouTube, then share the password with me via private message to this profile https://communities.intel.com/people/Amy_Intel.
I will have to take a look to that scenario, I will set the lab as similar as your system/hardware configuration.