Score can be easily manipulated to give a higher than "normal" rating. Suppose everything about the way you fly is considered your "normal". The plane choice, SA, risk-taking, etc. Now, limit your fighter sorties to instances with a short trip and high propability of success (like a vulch party off a CV). The ack is down and there are a few brave pilots trying to save the town against superior numbers. You pick a F4U-1C and make the short trip to hover over the enemy field. In no time at all, you've bagged a bunch of sitting ducks with 4 20mm cannons. Your landing is welcomed by a cacophony of WTFG!!!s on your clinic of aerial mastery. Now your Kills, K/D, K/T, and Hit% are all much higher than your established "normal". Do this a bunch of times and your score will pole vault way up there without your flying improving one iota.
Don't worry about other pilot scores as you don't know how they fly. Hook up with a trainer and they will help you improve.