Blow up

Ive been flying a fair bit recently, mainly the 109E3 on the syn full realism server. I have had many victories in the 109 but they are all hard fought, unless you are lucky enough to get a pilot kill you have to do many passes on a Hurri or Spit to bring it down or force it to leave the fight. I have never blown a wing off, or seen a plane blow up. I have sat right behind a spit just under its tail on many occasions and then slowy raised my nose and blasted it at point blank range with canons and mg's only to see the spit pull a hrad turn and start to battle with me. I have tried all different ammo load outs to the same effect. To me it seems something is definately wrong with the DM model.