Quote: 
Woo. Pretty crazy. The numerators should only be ~10% larger than the denominator below 1 Hz. Let's try again.

[Rana, Mirko]
I redid this calculation. The idea behind it is to get rid on any pitch that is introduced by applying longitudinal feedback to the mirrors. This coupling happens because the center of percussion for pitch , which is identical with the point where the wires lift off of the mirror, is above the center of mass.
With the same values as before, just less faulty math and Q = 2 instead of 10 we end up with the following filters:
For the lower coils (red), compared to corresponding preexisting BS filters (black):
The upper coils' TF is just mirrored at the 0dB magnitude axis, and have a corresponding frequency response.
I switched the F2a filters on for all MC mirrors. For convenience they are split into F2aZeros and F2aPoles. Everything seems fine. The F2a filters seem to be off for ( all ?) other mirrors. 