I'm looking to UG WT+ > CW using Avios on BA203 (17:00) LHR-BOS on 29 Aug.

Searching multiple times per day on ba.com, BA is taunting me with ever-increasing numbers of CW award seats on BA215 (18:00) and BA239 (19:25), current standing at high so far of 4 and 6 seats respectively. Been searching for this day numerous times per day for the last week and a half, and seen availability on the route come and go on an almost hourly basis, but not a sniff of anything on BA203 so far.

Does anyone know whether this is normal? I can still (cash) buy up to 9 CW seats on each flight (including BA203) if I was so inclined, so it's not sold out or anything.