Ok, after understanding what I needed to research, I found out that my Z-wave 300 series board is not compatible with ISY's firmware 5.x.x. Maybe firmware 5.0.16c is the only version that may be compatible with the 300 series board, however, I will just perform the upgrade to the 500 series board, then upgrade my firmware to the latest official 5.3.0 and retry the inclusion of the powernode outlet. That should hopefully work but will take some time to receive and upgrade my component. I believe I am on the most current admin console since I just upgraded that in November. I will report back when I get my new module and attempt my upgrades as per the various guides that have "suddenly popped up" once I was guided in the right direction.
Thanks again lilyoyo1!