I am running on Rub 1.45 and am early in my career. I noticed that when I had a career under "stock" settings, I could actually shoot down planes. Now, with Rub, I can't do crap with the Flak!

Does anyone know where the code is to modify the potency of the Flak gun? I have spent over five hours loading and reloading my game trying to shoot down one measly plane and have concluded that the gun sucks on the Rub model. Many thanks in advance for your advise!