Sorry, figured I was preaching to the choir being I’m the new guy here 
Specifically here is what I did. I have access to fdmcs.fanvil.com.cn. So I logged into my account there. From there I added my site for the set of phones, then added my phone via mac under devices. Next I went to config → common config and added a config called “Test Lab” and set it for the proper site. Inside that config I used the GUI method, not the text editor, and clicked on “Auto Provision” and set the following:
Server address (checked): http://my.domain.com/phoneprov/mytenantid
Protocol type (checked): http
Update Interval (checked): 1
Update Mode (checked): Update after reboot.
I’m pretty sure the interval is moot since it updates on reboot. If not, then cool, as I wish all voip phones would update in real time when changes were made. It’s not like they don’t already have a constant connection to the pbx after all.
After I created this common config, I ran the task to reboot the phone (these were freshly factory reset) and it grabbed the config from the PBX and all settings worked. Note that you can also do factory resets as well as reboots through this system.
Now I know Fanvil has a RPS service as well and I’ve requested access to that as well as they informed me that is supposed to be the ideal way to achieve this goal. However I have no experience on that UI so no idea if it’s better or worse.