Hello Jonathon,
I developed TOGA in 2020. Since it was developed for an internship and wasn’t verified against any benchmark, I recommend it primarily as a template for how you can convert OpenMC cross section libraries into isoxml format for Griffin. I am glad it has been useful to you so far.
Removal cross sections can be a bit tricky when you aren’t sure if (n,xn) reactions are being accounted for in the absorption. I would point you to this discussion for further details: Different k-eff in RESULTS and calculation - #13 by paulromano
Note that there is now a ReducedAbsorptionXS class in OpenMC’s mgxs library that might help.
Sincerely,
Miriam