Making Great Weapon Fighting Style actually Great.
This works for 5e, but it should be the same for 5.5e.
Great Weapon Fighting Style runs behind Dueling in it's damage adding only +0.8333 for a d12, +0.8 on a d10, and +1.3 on 2d6 vs Dueling's +2. '24 isn't better at +0.25 for a d12, +0.3 on a d10, and +1 on 2d6. Great weapons should have great damage.
> **Great Weapon Fighting Style** > When you are wielding a melee weapon that has the two-handed or versatile property in two hands your weapon attacks deal an extra 1d4 damage of the weapon's type.