Oh, I think it's near certain that Wade Crane and David Howard both broke the balls better than Lassiter, but Lassiter had a good one, too. I remember Bustie's 34 mph but both Jeff DeLuna and Mike Dechaine have been clocked at 38 mph, and CJ Wiley has posted about having seen Dechaine's effort live.
In fact, at Super Billiards Expo, perhaps 2016, there was a booth that had a table and a radar gun. Mike Dechaine would proposition the side-betters that given 10 attempts, he would have at least one break of 35+ miles an hour. It was a bet he usually won.
FYI, Irving Crane and I were friends and the reason I know about Johnny Irish's 12-pack against him is that Irving told me about it.