Fats, that sounds like a book I'd like to have

Anyhow, I don't think the issue with the Hispano's were it's stoppage rate, it had to do with it's detinator.
You know, the USN tested the Hispano's because they wanted a 20mm for their a/c. The concluded that they were were to unreliable to be used. They also went on to say that the MG151/20 in every aspect is what the USN wishes.
Well, the Germans never gave them the 151/20's

So they stuck with the 50cals sacrifing performance for reliability.