seating was fairly similar on both directions... row 22 and 16 i think.... .speedbrakes might be the answer.. it was a bit strange as the STN approach was sufficiently noiseless for me to wonder as to whether the gear had been lowered! ( unlikely, yes... unknown, no!!) but obviously had that been the case the TD would have been somewhat firmer and a bit more would have been written about it here.
also i found the A321 unnaturally long, it seemed to need another aisle... a bit more in proportion... oh well, the mumblings of a mad man no doubt!