What are the all-time ACBL speedball records?

Many years ago, on the evening of December 24, 2005, Meyer Kotkin (guymath) and I had a big matchpoint score at speedball: 88.4%.

I have been waiting to see an equally astonishing IMP score at speedball ever since. I saw a few scores in the 70’s.

On March 6, Mark Lair (mslair), Hall of Famer, and I (mseligman) had one in the 4PM ACBL Speedball: 87.35 IMPs!

All our hands were great, but a good one was board 9:

I bid 2♣, rather than 2♦ to deter a club lead against the game or slam in spades that was going to be bid.

Mark’s 6♣ cuebid also implied the Heart Ace, since he knew I likely needed that stopper.

Mark’s play was delicate and correct.

Do you know of a higher score?