At this point I am stumped.
With pfSense serving DHCP on 192.168.1.0/24, I was able to access the Route10 on 192.168.0.1, controller on 192.168.0.11 just like stated above. I set it up as normal, attached the local controller as normal. Control was on 1.0h, Route10 on 1.3p. Updated to 1.0t and 1.3u respectively. I changed the subnet to 192.168.1.0, and stopped pfsense from serving DHCP. Rebooted and everything is on the 192.168.1.0 subnet working just fine.
I am now able to use the Route10 at the head of the network, as well as behind pfSense without issue. The only thing I’m noticing is that it’s running about 10C hotter than I’ve seen it run before. <1% CPU load, 7-8% memory usage, essentially idle.
Power-on-resetting immediately reproduces all issues stated in the thread. No real resolution, sorry for anyone else having these issues. Maybe a help if someone else runs into this specific issue.