How to make a sword attack speed slower & it's range bigger?

I'm making a weapons mod for a small modpack I wanna make & I'm adding a long sword into it. A long sword is just like a normal sword, but it has more attack damage, it's sweeping range is much larger & it's attack speed is a bit slower.

At first, I used the type of sword. changing the attack damage is easy, but there is no way to change the sweeping range & also every time I change the attack speed into something, in game it reverts back to 1.6. To fix the attack speed problem, I chose to use the type of special, but now there is no way to sweep it. please help