Galaxy SII lite is the "infamous" i9070 (Galaxy S advance here in Italy). I have the same phone. First of all search a firmware update for your device. Samsung i9070 seems to have a serious problem with resources allocation. Sometimes games start laggy and bugged (every game, not only C2 games exported with cocoonjs), then when you close the game and restart it you get 3x FPS and an outstanding smoothness.
With native games this performance drop may be barely noticeable, but with C2 games you need your phone in perfect fit to achieve an enjoyable gameplay experience.
Many people around the world resolved this issue with an upgrade released some times ago (unfortunately this upgrade is not yet downloadable here in Italy).
Another thing. Check your collision mask, and try to set it to bounding box.
P.S. It's funny to know that in portugal the i9070 is called Galaxy sII lite and it's funnier that samsung released also the Galaxy SIII mini which is basically the same hardware with JellyBean instead of Gingerbread.