No, i only use the default settings with 11 Manually Assigned IP adresses.
The only thing I had recently adapted was the AC68U All Region & Channels + Max TX Power.
The log contains the following.
NVRAM usage
42134 / 65536 bytes
After a reboot, the message "nvram: consolidating space!" remains regularly come back.
Nothing abnormal there. The nvram partition will get fragmented over time. When the kernel fails to set a new nvram setting due to fragmentation, it will generate that notice message, and defragment the nvram. This is not an error condition, this is normal behaviour.