TooT might still be better for absolute signal/noise ratio, but two should be enough to (mostly) de-rot two rotted but otherwise indentical disks. Needs more testing once I have the averager updated to work with the new metadata I'm producing.
As for phase inversion - dunno if that's a real thing or a trick to make the comb filter used go full-3D. I'd have to see an example of it in motion to say.