J. Kissel,

Early signs from yesterday's measurement: The DARM coupled cavity pole is now up at 355 [Hz], much closer to the designed/ideal/predicted LLO value of 389 [Hz] (LLO aLOG 15923). Hopefully it stays consistent with today's measurement (or is higher!). Also -- since I'm getting great coherence out to several [kHz], I can expose and refine the precision the ESD driver pole frequency (nominally at 2 [kHz]; T1000220, specifically, pg. 6 of 'ESD_PA95_circuit_diags_comp_overlays_1_of_6.pdf'; preliminary results are pointing to that it's actually 2.2 [kHz]). 

I'll post full analysis of both measurements compared against all prior measurements in a bit, but this DARM OLG TF I just took lives here:
/ligo/svncommon/CalSVN/aligocalibration/trunk/Runs/PreER7/H1/Measurements/DARMOLGTFs/2015-05-02_H1_DARM_OLGTF_LHOaLOG18181.xml
For this measurement, I 
- decreased the frequency range to *actually* 5 to 5000 [Hz] (because getting down to yesterday's 3 [Hz] took too long). The measurement now takes 25 minutes.
- decreased the drive envelope's amplitude above 1 [kHz] by 2, to make sure (a) I don'tneed to turn of the ETMY L3 stage digital limiters, and (b) I'm sure it's not me ringing up the violin modes
- increased the drive envelope's amplitude below 10 [Hz] by 2, in attempts to get better coherence in the 5 to 15 [Hz] region. It didn't work, will try to drive harder there next time.

Relevant loop gain information also attached.