I installed the latest Realtek LAN driver from the Intel NUC support page.
This updated my NUC LAN driver from version 9.1.402.2015 to 10.1.529.2015.
This newer LAN driver now has the option to use Jumbo Frames (which needed to be enabled again) up to 9k from the older driver 4k limit.
Upon pinging another machine already running Jumbo Frames at 9k I was ABLE to SUCCESSFULLY pass the 9k packets so the problem seems to be solved.
Thank you for sharing your feedback, I am glad to hear that you were able to resolve your issue.