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1) You are a melee character. The ONLY benefit to the increased knockback is MINIMAL incoming damage reduction from being surrounded by enemy melee characters. By knocking them back slightly farther they have to run for a split second longer to get back into melee range of you. Obviously, this affects YOUR ability to hit THEM as well. Overall, this just doesn't seem that effective for a melee character.
Sweep used to always knockback. It was completely and utterly broken. You could take basically no damage because you push them out of melee range and they'd walk back in to try to hit you again at the point you could sweep again.
