If enable : # Restores circuits and their recipes from Pre-5.09.28 times. [default: false]
B:enableOldGTcircuits=true
# Adds custom circuits to expand past the Master Tier. Only really recommended to enable if enableOldGTcircuits is enabled. [default: false]
B:enableCustomCircuits=true
https://pastebin.com/NUDqBz8f

I never remove config options, unless it's debug related. As noted, will investigate.

I Think this one will require a bit of work to fix.
@codewarrior0 So, I need to reorganize the load order of.. everything.. keen?

Nothing has changed in months regarding this code.. I guess I'll take a look?

This option did not seem to be in the 8 build.
Adds custom circuits to expand past the Master Tier. Only really recommended to enable if enableOldGTcircuits is enabled. [default: false]
B:enableCustomCircuits=true

Ping!

So, I have sent the fix to @leagris and when she submits it via PR, this & #262 shall be resolved.
The issue was actually a lot simpler than I ever thought.