First off, which jug are you flying? I consider the d11 to be in a different class alltogeather then it's two younger brothers. Morph's comment on weight doesn't seem to hold true as much to the d11, if you know how to handle it. The d11 can get it's nose up about as quick as a 38 when at low speeds if you know how to manage your E in a knife fight. It's stability is only matched by the 38 and p40, the 51 may feel lighter but it can't pull Gs at all like the d11. This allows it to use slow fighting tactics to take control of the angles. It also seems to have the nicest stall of the three Jugs. I've found success in this plane by knife fighting it like a 38, just expect the nose up performance to be weak and the nose down performance to be unmatched. Once those flaps come out the nose down turns will win you many fights.
The extremely basic approach to flying the d11 to it's strengths would be to start with a double immel, popping full flaps on the top of the second, and doing a low yo-yo or split-s to match the turns of the lower con. Once you get a good feel for these turns you can get more aggressive and fight below your opponent, looking for a chance to use your superior (smaller) turn radius to pull up into him.
-p.