I don't know about the Typhoon being Gelded, but I would figure that all the Hispano planes would have been effected equally by any change.
As far as the .50s go (and I know this is a forbidden "hypothetical" answer.. sorry) I think that the blast damage from the cannon shells makes it easier for you to hit the Acks, than the kinetic damage from the .50s (that is to say, a near-miss with the cannons can be effective, while the .50 has to actually make physical contact). Same with Troops. Try using the Il-2 guns to take out ack, they should have similar results to .50s (given their AP rounds).
-Sik