As per Kiwamu's request I made a light touch to the input steering and the mode matching lens.
Here V_ref and V_trans are C1:IOO-MC_RFPD_DCMON and C1:IOO-MC_TRANS_SUM, respectively.
Result: Visibility = 1 - V_ref(resonant) / V_ref(anti_reso) = 1 - 0.74 / 5.05 = 85%
What has been done:
- Alignment of the steering mirrors before and after the last mode matching lens
V_ref: 2.7 ==> 2.2, V_trans: 34000 ==> 39000
- Moving of the last mode matching lens away from the MC (+ alignment of the steering mirrors)
V_ref: 2.2 ==> 0.74, V_trans: 39000 ==> 55000
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