If the only thing you don't like about the K4 is the 30mm, you might want to take the time to learn how to use the 30mm. There are far, far better people to teach you how to use it, but here's the basic gist of how I use it:
- Don't fire outside of 200 yards in the beginning. The dispersion on it starts to look like silly string outside of 500 yards, and bullet drop is significant. If you connect, they die, but it's tough to reliably hit them from far.
- Try for 2 or 3 round bursts. As you get better with it, single rounds are the goal.
- Try to set up shots where they are crossing your nose showing more of the plane as opposed to trying to put a bullet stream into them from dead six. It only takes 1, maybe 2 taters to wreck a fighter unless you put it into one of the horizontal stabilizers. Engine hits may or may not be critical. Otherwise, you put one on a fighter, it goes down. It's a bit counterintuitive, but it really does work.
For myself personally, I fly it what I call 'execution style'. I get in as close as I can, put the barrel against the back of his head, and pull the trigger. Ideally, I'm 100 yards or closer when I pull the trigger and the guy is in planform filling my windscreen.
In the beginning, the K4 is an easy plane to survive in, tough plane to kill in. As you get the 30mm figured out, it becomes one of the most potent planes in the game.
Wiley.