Sure they did, as the MC72 used Bank's fuel mixture to get that 3000hp. In fact it was F. Rodwell Banks who finally got the Fiats to run correctly.
If it has not been mentioned, the MC72 killed 2 pilots, Monti (Aug 2 '31) and Bellini (Aug 10 '31) because of the lean fuel-air mixture. Banks fixed this problem as well.