Hi @burwell,
I’m going to ping @jdkent and @rastko here, as they are our experts in denoising :D.
There was some great discussion about this issue here https://github.com/poldracklab/fmriprep/issues/817, with two great outcomes in the form of Jupyter notebooks (here and here).
Hopefully, you’ll find there some useful information.
Cheers,
Oscar