I get 7/13/51 about 60-65 dps above 0/14/57. Maybe I have an older version spreadsheet...
Edit: Indeed it was an older version.
I still get 1/2 RR + 1/2 RK as 67 dps over 0/2 RR and 2/2 RK. It seems the mana gains from 1/2 RR is enough to prevent needing AotV on the 6 min test. Even when I drop length to 5 minutes with zero AotV needed, 1/2 RR + 1/2 RK still comes out ahead.
And even with v85h, 7/13/51 is 63 dps ahead of 0/14/57.
Rapid Killing only provides a benefit at certain intervals. Even if you know enough about the future to choose 1 or 2 points, the gain of a single Rapid Fire is quite small. I blame the low value of haste.