It's already frustrating enough at times to play a tank, and the changes to enchants will now make that even more frustrating.
Solution:
Rank 1: Increases your Weapon Damage by 3%, enchant strength by 150% and the amount of damage you can block by 10%
Rank 2: Increases your Weapon Damage by 5%, enchant strength by 200% and the amount of damage you can block by 20%
With this change, S&B wouldn't suffer for the changes.