I don't think it needs improved, it is already more powerful in the game than in reality. I have never seen an instance of a plane shot down with the 37mm gun, or the howitzer variant, let alone the machine gun variant, which is the most plausible. Faster reload times would lend more power still to the tanks, when chutes and tanks were not threats to actaul WWI aircraft.

There is too much defensive firepower now; a chute rifle holding 3 times the ammo than usually found in an infantry rifle, firing as fast as modern automatics or faster, and somehow fitting in the tiny cockpit to be ready a half second after a jump. A tank that magically appears where you land, that can be crewed by the lone pilot, aimed easily,and take down aircraft that it was never meant to do. Radar warning tanks of aircarft coming n overhead or from flanks.

If anything, I would like to see the tank option from the base, not from an advanced position on the field. Drive that puppy all the way.