Additional information:

For moving PR2 and IMMT2, I used following channls.

PR2 pitch: K1:VIS-PR2_IM_OPTICALIGN_P_OFFSET (changed from 0 to -29750, good OpLev: 0.193)
PR2 yaw: K1:VIS-PR2_IM_OPTICALIGN_Y_OFFSET (change from 0 to 2700, good OpLev: 0.268)
IMMT2 pitch: K1:VIS-IMMT2_TM_OPTICALIGN_P_OFFSET (canged from -11500 to -3500, good OpLev: 0.256)
IMMT2 yaw: K1:VIS-IMMT2_TM_OPTICALIGN_Y_OFFSET (changed from -450 to 2900, good OpLev: 0.373)

After the work reported in the original post, PR2 and IMMT2 were tweeked for finding flash of X-arm.
Fig1 shows the setup for excitations.
Unfortunately, there are no spike at the TMSX PD (fig2).