Okay, I remember now.
Basically, I worked backwards from a 54.3% server win rate in
S games and a 46.0% server win rate in D games, assuming an alpha
of 0.70. If you solve for a SER constant to inflate the server's
point-win in S and a REC constant to inflate the receiving team's
point-win in D games, you get 1.0597 and 1.0540 respectively.