ARG, I accidentally permuted the digital demod angles. This significantly weakens the argument for believing AS55I is broken... In fact, Jenne and I did some investigations this afternoon that showed that the channel is indeed working. SRX error signal strangeness remains unexplained, however.
Also, I have yet to compensate for the gain of the violin filters; the actuator calibration numbers I used were for the SUS-LSC FMs, not the LSC FMs where I was injecting. New measurements will be taken soon, as well, since REFL165 is hopefully improved.
Corrected plots are below.