Follow up to alog 30294

I've re-measured the open loop transfer function of Mode2 a few times after decreasing gain and tweaking phase to try to move towards stability. Halving damping gain halves loop gain (31 --> 16) but neither changing damping phase (+/- 30 deg) or phase picked up from bandpass (30 deg --> 0 deg) changes overall loop phase; all still leave us with ~160 deg phase differential.