Lol yeah simple 'do some of that pilot sh!t man!'
Thats the most helpful advice ever. That wiki link is good tho. Click through on it, find this; https://en.wikipedia.org/wiki/Basic_fighter_maneuvers and learn about yo-yo maneouvers and how they can be used to cut a corner. Also be careful with stick deflection. You pull too hard you lose all of your energy for a short burst of turn rate. Far better to watch that AoA meter in the left corner of your dash so that it doesn't get pulled into the red. You get better sustained turn rate. Now couple that with slight out of plane (above or below the horizon) rolls and you should do better.
Actuall you can sneak up on the DCS AI. Try turning your radar off and keeping it in the weeds until you pass below the intended victim, then plug in the burners and pull up behind him. He will not start dumping flares until your missile is under way!