Well, still having difficulty determining which Wing and Bomb Group was responsible for these 14/15 45 missions to Sapporo.
Here is the 20th AF web site and their mission chronology.
https://www.20thaf.org/
Unless I'm missing something there is no record here of these Sapporo missions, odd, given the great ordnance detail offered by Pacific Wrecks used during these missions. Even if flown from Saipan this would have been one of the longest distance missions of the Pacific War, so it's surprising some Bomb Group is not eager to take credit for these missions. The hunt continues.