Here are the corrections for the RS meter. Unfortunately, I only kept the #'s I was concerned with at the time. Use C weighting and the slow response:
20hz +7.5
25 +5
31.5 +3
40 +2.5
50 +1.5
63 +1.5
80 +1.5
100 +2
125 +0.5
160 -0.5
200 -0.5
250 +0.5
315 -0.5
400 0.0
500 -0.5
630 0.0
calib @ 1K 0.0
20hz +7.5
25 +5
31.5 +3
40 +2.5
50 +1.5
63 +1.5
80 +1.5
100 +2
125 +0.5
160 -0.5
200 -0.5
250 +0.5
315 -0.5
400 0.0
500 -0.5
630 0.0
calib @ 1K 0.0