Damionte pretty much nails it. The K-4 is an entirely different beast (and let's give her the respect she deserves, she IS a beast) and flying a ship like that is a whole new ballgame. You have to take any shot you can get, so can't afford to wait for a nice six shot. Any time your target crosses your guns, whatever the angle, you have to be ready to pull the trigger. This is the thing the guys who think stall-speed turning on the deck is the only way to fight don't want to realize, is that hit-and-run fighting is not cut, dry and dull, but presents a whole new set of challenges.
You have to know how far to extend. Sure, you can make all your passes from 5k out, but that's just going to give your opponent time to breathe and react. 190s sitting at altitude and picking from 5000yds barreling through at 500mph are irritating, but generally easy to see coming and get out of the way of unless you have to deal with another con. The guys I worry about most don't extend much beyond 1500yds to set up their next pass.
Keep your speed up. The first thing those Spits, Zekes and Hurricanes are going to do is try to bleed you of E so they can get you into a slow turn fight where they'll eat you alive. If he breaks, DON'T FOLLOW. Nose up and extend, or use energy-saving maneuvers (lag rolls, high yo-yos, etc) to pursue without blowing your energy.
As Baldy said: Use the vertical. Remember that you've probably got energy, so long as you don't give them a nice fat overshoot they shouldn't be able to touch you. Go vertical BEFORE you overshoot. Set yourself a minimum range to pull out, and if you can't get a shot in that time break off and point your nose in the air. Your zoom should leave any opponent wallowing in your slipstream if they try to follow you up.
Practice your gunnery. Know your weapons: How fast do they cycle? What's their muzzle velocity? How much does the round drop after firing? If it's a machine gun, what's its most effective range? Do you have a mix of machine guns and cannon? Are they wing-mounted, nose-mounted or mixed? Set your convergence to where you feel most comfortable. Learn how much lead you need to give. If you have a mixed package (most German Iron, P-38s, P-39s, etc) you need to account for the different rates of fire, muzzle velocities and round drop. If you want to take a snap-shot with the 30mm spud gun you need to give a lot more lead than you do with US .50cal or the Hispano 20mm.
In a BnZ fight you can't count on a nice clean shot. You HAVE to be prepared to take a high-deflection snap-shot. Fly to where your target is GOING to be and take that shot, even if it's the worst possible deflection angle imaginable. As long as you know exactly where to put your guns you've still got him.