Although you've changed the engine to play like Melee, it still doesn't feel exactly like Melee. It's off a little. What gives?
Despite our best efforts, there are still a few things that have been resistant to editing. For example, when landing from a jump in Melee, most characters would not be considered 'on the ground' by the game until their feet were completely inside the ground and their shins touched it. This was changed in Brawl to having a character land when a specific, unmoving, invisible point below the centre of his body touches the ground. Though this point is normally near where characters' feet are, it causes them to effectively teleport to the ground when their bodies are positioned horizontally (ie during Mario's bair or Link's nair). Beyond making little sense, this change subtly but noticeably modifies the timing for some techniques and is undesirable to have; however, the Project M coders have not been able to revert it.... yet.