if bandits get on your six you are not flying like you should. Boom and zoom tactic works well if you can hold her higher by miles up than the bandit. Its exclusively warbird tactic. If you cant shake the bandit, speed away but do NOT climb. 109 is a superb climber (its basically a space shuttle). Do NOT, again, DO NOT climb with the 109. Watch his ailerons and general direction. If he climbs that is because he wants you to overshoot, which is again, BnZ, or lag displacement roll he is doing. To counter this, you must slow down as he will eventually lose speed when higher then descend upon you. When he does that, turn towards his turn plane then when he passes you descending, you perform a lag displacement roll climbing, if you feel he is getting closer.
Another thing is, do not speed away if he is AI. He WILL kill you. If you are separated enough, then and only then you only speed away. Once a few miles ahead, climb and place him on your twelve. Can you post a track?