I believe FD is looking at adjusting the AI skills at lower levels.
Regarding boosting, not all ships have the same top speed. Unfortunately, a Sidewinder with non-upgraded thrusters can't necessarily outrun everyone. A common tactic when faced with a faster ship (which in your case is probably most ships) is to dump chaff to confuse any gimbal or turret weapons, turn Flight Assist off, flip 180 degrees at your enemy, and boost straight at him and do a flyby. Yes, you'll likely take a faceful of lasers, but hopefully the chaff will help. Since shielding is the same all around, it doesn't matter if you take it in the face or take it in the behind. However, by flying past him going the other way, he now has to turn around, which will buy you some precious seconds.
Flight Assist, if you don't know, is the system that makes the flight model feel like you're flying an airplane. With Flight Assist turned off, it will feel more like flying in space with no air resistance. So by turning FA off, you can flip your ship around without making an arc. You would instead be drifting backwards if you flip 180 degrees around. This means the NPC won't be able to follow behind you since there's no turning arc to follow. To turn Flight Assist on or off, you can set it as a toggle or as "while holding down a key" in your key mapping.